Alexander VIII (1689-91).--The physician to this Pope was Romulus Spezioli, doctor of philosophy and of medicine of the University of Firmo, who acquired a great reputation at Rome as physician and finally was selected as Papal Physician. He became professor at the Sapienza, the Roman University, and was very popular as a teacher. After the death of the Pope he gave up his profession of medicine and, like Linacre a century before, became a priest, but his scientific knowledge was taken advantage of to enable him to give lectures on subjects in the borderland between religion and medicine, what has come to be called in our time pastoral medicine, to the theological students at the Roman University, and his medical experience was used in the causes of canonization in order to pass on miracles.
Innocent XII (1691-1700).--Both of the physicians of Innocent XII, Malpighi and Lucas Tozzi, are very well known. Malpighi deserves in medical history a place beside Harvey as one of the greatest of the contributors to the medical sciences and probably even a niche higher than the Englishman because of the number of original observations that he made. I dealt with him earlier in this volume. Lucas Tozzi is the author of a series of books on The Theory and Practice of Medicine that are classics. One of these was issued at Lyons in 1731, another at Paris in 1737, and a commentary on the Aphorisms of Hippocrates at Naples, 1743. He {465} wrote also a commentary on the Ars Medicinalis Galeni, besides smaller contributions to medical theory and practice. One of his books, with the title De Anima Mundi, The Soul of the World, in which he brings together a large number of the fallacies of philosophic writers before his time regarding the universe and man and their origin and destiny, was widely read. He suggests not only how little there is that we know, but how much there is that we think we know that is not so.
Pope Innocent XII died in 1700, and with the beginning of the eighteenth century we feel that we are in our own times. Whatever of direct opposition there has been supposed to be between the Popes and science has always been traced to the older times. It was nearly always shrouded in the mists of medieval history. It does not seem so important then, to follow out the lives of the Papal Physicians in detail in the eighteenth and nineteenth centuries. For anyone who wishes really to know, the information is readily available. There is abundant evidence, moreover, of the favorable attitude of the Popes towards the medical sciences and a number of distinguished men are among their physicians. The great Morgagni, who in his time was undoubtedly the greatest of living physicians, was the intimate friend of a number of Popes and was frequently consulted on all scientific as well as medical matters. Both Pope Benedict XIV (1740-58) and his successor Clement XIII (1758-69) insisted, as we have said in the body of this volume, on having the great pathologist consider the Papal Palace always open to him as a place of residence, whenever he visited Rome. Almost needless to say this same favorable attitude has continued during the nineteenth century.
Pius VI (1775-99).--Among the physicians who treated Pius VI during the severe physical trials of a stormy pontificate was Professor Cotugno of Naples, to whom we owe a number of important discoveries in medicine. He was the first to point out the presence of the cerebro-spinal fluid and ably supplemented the investigations of Valsalva on the ear which did so much to clear up many problems in connection with that organ, most of whose anatomy we owe to Italians. He made a careful study of sciatica, De Ischiada Nervosa, Vienna, 1770, which is the classic foundation of our modern knowledge of that affection. He made a series of post-mortem observations on typhoid fever in which he demonstrated very clearly the intestinal lesions of that affection and came very near solving the important problem of the pathological basis of the disease. Like a number of others about the middle of {466} the eighteenth century, in spite of acute observations on intestinal lesions, he could not get away from the theory of fevers being constitutional and so was unable to separate abdominal typhus from dysentery on the one hand, nor true typhus on the other. The constitutional nature of the disease we have come to recognize to some extent again after the pendulum had swung very far in the direction of the declaration of its local character.
Pius VII (1800-23).--One of the physicians of Pope Pius VII was Professor Giambattista Bomba, who was professor of physiology at the Sapienza or Roman University of that time. One of the surgeons in attendance at the Papal Court was Antonio Baccelli, the father of Professor Guido Baccelli, the distinguished Italian scientist and statesman of the modern time.
Another of the physicians of Pius VII was Flajani, to whom we owe the first description of the affection known as Graves' Disease in English-speaking countries, and often as Basedow's Disease on the Continent, though the English physician Parry anticipated both of these in 1822. Graves' description did not come until 1835, Flajani's had been published in 1802; Basedow did not write the more complete description in which he called attention not only to the goitre and the rapid heart action as his Irish and Italian predecessors had done, but also to the exophthalmos, which is so common an accompaniment, until 1850. Flajani was distinguished for his ability as a clinical observer as his priority in this matter would well suggest.
Gregory XVI (1831-46).--The two of Gregory XVI's physicians who were best known were Professor Paolo Baroni, the distinguished Professor of Surgery, the University of Bologna, and Pier Luigi Valentini, Professor of the Theory and Practice of Medicine at the Roman University. At the conclave which followed his death for the election of his successor, Professor Giusseppe Constantini, the Professor of the Institutes of Surgery at the Roman University, was in attendance. [Footnote 53]
[Footnote 63: When the material of the famous Challenger expedition was being assigned for investigation to those who were expected to use it to the best advantage of science, the diatoms were handed over to the study of Francesco Castracane degli Anteminelli. He discovered in the material submitted to him three new genera of diatoms, 225 new species and some thirty varieties. Altogether he had written some 112 papers on the biology of his favorite microscopic plants. Castracane was a Catholic priest living at Rome in high favor with the ecclesiastical authorities and directly encouraged by the Pope in his work.]
Leo XIII (1878-1903) was so situated in his relations to the Italian government that it would have been almost impossible for him to have selected one of the distinguished professors at the {467} University at Rome, which was, after all, a government institution. His physician then was chosen from distant Ancona and proved to be a man of distinct intellectual capacity, who impressed himself upon the science of Rome in certain ways. This was Dr. Joseph Lapponi, whom those of us who had the privilege of meeting remember with special pleasure. He was professor of practical anthropology at the Academy of the Historico-Juridical Conferences of Rome and the author of a book on "Hypnotism and Spiritism; A Critical and Medical Study," which ran through two or more editions in the original Italian and was translated into several foreign languages. The English edition published by Longmans is well known.
Pius X (1903-14).--Dr. Lapponi continued as the Papal Physician of Leo XIII's successor until his death. Political conditions in Rome having been modified somewhat Professor Marchiafava of the Roman University, now in the hands of the Italian government, became the consultant Papal Physician, the latest of a long line of distinguished men. Marchiafava has done some excellent work with regard to malaria, working out the life cycle of the malarial parasite and demonstrating that the organisms of pernicious malaria and the tertian and quartan malarial fevers are quite different. In recent years Marchiafava has been particularly interested in the pathology of alcoholism, being a prominent factor in that movement in Europe which during our time has made it very clear that alcohol is never a stimulant but only a narcotic and that in practically all cases where it is used regularly, even though not consumed to excess, it produces definite pathological changes in human tissues.
With this list before him, the reader will have all the material necessary to understand the declaration that there is no series of men whose names are connected together by any bond in the history of medicine, even as members of the faculty of our oldest medical schools, that represent so much achievement and original investigation in medical matters as the Papal Physicians. With these men beside them as advisers and very often as intimate friends, it would have been quite impossible for the Popes to have been deliberate opponents of scientific progress. We all know that by a curious irony of fate physicians are sometimes found ranged against the line of advance in medical science, but this is inevitable with human frailty and the incidents of opposition have not done nearly so much harm as their conservative refusal to listen to enthusiastic discoverers, whose discovery was of no significance, has done of {468} good. No medical society in the world has an unblemished record of constant readiness to accept genuine new discoveries and all of them have sometime or other been in opposition to what proved eventually to be significant scientific progress. There are no striking incidents in the lives of the Papal Physicians in this regard though their admiration for Aristotle, Hippocrates and Galen sometimes kept them over conservative. As a rule, however, they were ready to welcome every new step in medical advance that was made.
We all know how much a man's physician usually means in influencing him with regard to the attitude that he shall assume towards scientific advances generally and particularly announced progress in the biological sciences. The Popes could scarcely have had better advisers in this matter than the men who were actually chosen as Papal Physicians. They came from every part of Italy and sometimes even from other countries. A library consisting of their works alone would contain an extremely valuable collection of books illustrating nearly every phase of advance in medicine.
Some Roman Astronomers.
A formal list of Papal Astronomers in any way comparable to that of the Papal Physicians cannot be given. Astronomy is not so compelling in its interests as medicine and while man's first serious scientific interest is his body, and the first modern university, that of Salerno, was founded around a medical school, the development of astronomy as a science was practically delayed until the Renaissance. Though a formal list of Papal Astronomers is not available, there is, however, a long series of names of workers in astronomy at Rome, some of whom occupied positions in the Papal capital actually called by that name, with many others who merited it for the work they did with Papal aid and encouragement. A large number of astronomical investigators conducted their researches under the patronage of the Popes, often dedicated their books, with permission, to them, were frequently supported by Papal revenues and had their observatories supplied by the Papal government, or else they were in intimate relations with the Papacy and received every stimulus for their researches.
For special purposes, as the correction of the calendar, distinguished astronomers were summoned from long distances to Rome. At the Sapienza Papal University and later at the Roman College directly under the control of the Jesuits, but with the entire approval and constant effective good-will of the Popes, men of great distinction in astronomy and mathematics have frequently been professors. Some of the very greatest contributions to the science of astronomy have been issued not only with dedications to the Popes, as I have said, but not infrequently have been printed at the expense of the Holy See.
In the chapter on Papal Physicians I have suggested that no list of men connected by any bond in the history of medicine are so distinguished as the roll of the Papal Physicians. The faculty of no medical school, for instance, no matter how long it may be able to trace its history, contains so many distinguished names. This same thing might well be said of the list of men who have done distinguished work in astronomy whose names are in some way {470} connected with the Papacy and whose relations to the Popes make it very clear that far from a determined course of opposition there was, on the contrary, a definite policy of encouragement and patronage for astronomical workers and that this greatly helped the diffusion of valuable scientific information with regard to the heavens and made the ecclesiastics of the world particularly interested in these important advances in human knowledge. In this appendix, then, as a complement to the appendix on the Papal Physicians, I have brought together some of the names and the achievements of astronomers who worked at Rome or were in some way connected with the Popes. I know that it is incomplete, but even as it stands it is a strong confirmation of that principle so surprising to many presumably well-informed people that the Popes were, as far as conditions permitted, always the patrons, not the persecutors, of scientists in all departments of the purely physical as well as biological, theoretic and applied sciences.
It is sometimes assumed in the modern time, and it used to be the custom a generation ago for nearly everyone in English-speaking countries to assume, that because we knew very little about science in the medieval period it must be because there was very little to know. We have learned the fallacy of that supposition to our cost, by the republication of the great text-books of medicine and surgery of the medieval period and by the deeper study of such great scholars as Roger Bacon, Albertus Magnus and St. Thomas Aquinas. Even the scanty records that we have show us the Popes following the same sort of policy with regard to education and science as at the present time. Men who collected scientific information for academic or popular diffusion, as Isidore of Seville, Albertus Magnus, Thomas of Aquin, were not infrequently raised to ecclesiastical dignities during life and placed among the saints after death. Occasionally a distinguished scientist like Gerbert, who became Pope Sylvester II, or Petrus Hispanus the well-known physician, who became Pope John XXI, were even made Popes. It is easy to understand that their attitude as Supreme Pontiffs towards science would be not only not one of opposition but of sympathy and helpful patronage.
While as I have said astronomy as a formal science practically did not develop until the Renaissance, there were a series of important discussions of the relations of the earth to the other heavenly bodies and of the size and shape of the earth itself among the professors of the medieval universities, and the perfect freedom with which these discussions were carried on shows how unshackled {471} was human thought. Albertus Magnus discussed the antipodes, dismissed the notion that if there were men on the other side of the earth they would surely fall off by the thoroughly Socratic remark that we ourselves were on the other side from them yet did not fall off, and understood and taught very definitely the rotundity of the earth and other doctrines that are usually supposed to be much more recent, and that are often said to have brought their holders into ecclesiastical odium. Far from this, Albert was always in high favor and was made a bishop and canonized as a saint after his death.
Roger Bacon studied light, declared that it moved with a definite velocity and gathered and made good use in his teaching of an immense amount of information in the departments of knowledge that we now call astronomy and geography. Humboldt declared that it was a passage from Roger Bacon which more than anything else, even the Toscanelli letters, roused Columbus to his life purpose of sailing westwards. Roger Bacon's books, the one with the paragraph now famous because of its connection with Columbus among the number, were issued at the request of the Pope and it seems very probable that we would have had no idea of his marvellous anticipation of many modern scientific truths only for the definitely expressed wish of the Pope to know the English Franciscan's thought. We have just celebrated the seventh centenary of Roger Bacon's birth, and this has brought home to us how much of a loss to the history of human culture would have been the missing of Bacon's works. Bacon's difficulties in life were with his Order and were personal matters not directly connected with his science.
With the beginning of the Renaissance the stimulating effect of the study of Greek science on the men of the fifteenth century was exerted and one of those who was most deeply touched by the Greek spirit was Cardinal Nicholas of Cusa, or Cusanus, as he is called from the Latin name of his birthplace. He wrote a series of books touching many matters in science and treating various phases of mathematics. He dwelt particularly on certain problems relating to geography and astronomy. I have summed up his scientific career in a chapter of "Old Time Makers of Medicine" (N. Y., 1911). He taught the rotundity of the earth and that the earth was the same sort of a body as the other stars in the heavens, that it was not and could not be the centre of the universe and that it had a movement of its own. Far from such revolutionary teaching leading to his persecution or bringing him under the suspicion {472} of the ecclesiastical authorities he was, on the contrary, looked up to for his scholarship, received successive ecclesiastical preferments, became Bishop of Brixen and then Papal Legate to Germany for the reform of abuses, and finally a Cardinal. He did much to encourage interest in mathematical, geographical and astronomical science, provided opportunities for students, encouraged Puerbach and Regiomontanus in their significant pioneer work in mathematics and astronomy, and generally showed himself the enlightened patron of every movement related to the physical sciences, and all the workers with the experimental method.
The first epoch-making astronomer who was brought into intimate relations with the Pope of whom we have definite knowledge was Regiomontanus. He is deservedly known as the Father of Modern Astronomy for his initiation of series of calculations and publications with regard to the heavens and his establishment at Nuremburg of a regular observatory. He was summoned to Rome to direct the calculations for the correction of the calendar, but unfortunately died there at the early age of forty. His invitation to Rome for this purpose came within the same decade when, if we were to trust certain modern historians of the relations of the Popes to science, Pope Calixtus III issued his supposed bull against Halley's comet. The bull has never been found. The attitude of the Popes towards science is much better illustrated by the invitation to Regiomontanus and the encouragement of astronomical research thus afforded than by the fictitious bull against the comet. The supposed bull has, however, played a large role in convincing a number of people of Church opposition to science, some of them being professors of science who knew nothing about the almost simultaneous appointment of Regiomontanus as Papal Astronomer.
Toscanelli, over the question of whose influence on Columbus an as yet unsettled controversy is waged, was a lifelong friend of Nicholas of Cusa, they had been schoolmates at College and undoubtedly the great cardinal doctor of laws or of decrees as they said at that time, owed much of his progressive advanced views on scientific subjects to his Florentine friend "the doctor of physic, Paul Toscanelli." Cusanus at the height of his fame dedicated his book on Geometrical Transformations "to Paul the Florentine physician." Regiomontanus, as well as Cusa, often sought Toscanelli's opinion on abstruse questions of mathematics and quoted him with confidence. The intimate relations of Cusanus and Regiomontanus with the Popes of the middle of the fifteenth century are very well known. Toscanelli's services to astronomy are only {473} less famous than those to cosmography. A series of his careful and painstaking observations and calculations of the orbits of the comets of 1433, 1449-50, of Halley's comet of 1456 and of the comets of 1457 and 1472 are preserved in manuscript. They demonstrate his profound and successful interest in astronomical subject and it is easy to see that they must have cost him, as indeed he tells in his letters, many a night's watching of the stars. The relations between the ecclesiastical authorities and Toscanelli are very well illustrated by that well-known monument to his astronomical skill which still interests visitors so much in the Cathedral of Santa Maria del Fiore at Florence. This is the gnomon arranged in the dome of the Cathedral by the shadow of which it is said that he could determine midday to within half a second. The use of the Cathedral for this purpose is interesting testimony to the cordial relations of science and religion at this time. It may be said in passing that Toscanelli's gnomon was later improved by Cardinal Ximenes of Spain, showing that these cordial ecclesiastical relations with science were not confined to Italy.
While Toscanelli was making his observations Antoninus of Florence was for some thirteen years the Archbishop of the city and was one of the learned members of the Dominican Order at this time, who had made his novitiate among the Dominicans with Fra Angelico and Fra Bartholomeo the great Renaissance painters. Antoninus was greatly influenced evidently by his associations with Toscanelli and formed one of a group of men containing the Florentine physician astronomer, Cardinal Cusanus and Regiomontanus, himself afterwards a bishop, who were on terms of intimate relationship at least in scholarly matters at this period. Archbishop Antoninus, who is the author of a Summa Theologica Moralis of which no less than fifteen editions were printed after his death, wrote also a series of histories in which he shows this influence by insisting that comets are celestial bodies like the others in the heavens and had no effect on the physical or moral conditions of the world and, quite contrary to popular beliefs, were not responsible for war or pestilence nor prophetic of evil to mankind. There had been a number of brilliant comets in the heavens about this time and there was consequently a widespread interest in them and much popular superstition with regard to them. Antoninus was on terms of familiar intimacy with Pope Eugene IV, who insisted on his becoming Archbishop of Florence, though Antoninus would have preferred to have remained a simple Dominican and keep his leisure for his scholarly work. When the Pope felt his end {474} approaching he called Antoninus to Rome to administer the last rites of the Church to him and be by his side during his last hours. Antoninus was frequently consulted by Pope Eugene's successors, Nicholas V and Pius II, both of whom were among the scholarly patrons of learning and art at this time. Some fifty years after his death Antoninus was canonized by Pope Hadrian VI, the scholarly Pope from Utrecht in Holland. His whole career then shows clearly the relations of the ecclesiastics and particularly the Popes of the time to science in a most favorable light.
The relationship with the rising science of the Renaissance period thus initiated was continued during the following century. At the end of the fifteenth century Copernicus studied for ten years in Italy and felt so thoroughly the interest of Italians in advances in science as well as scholarship that when some years later he came to formulate his great new hypothesis of the heavens, he sent an abstract of his theory to some of the Roman teachers with whom he had become intimate during his stay and it was taught publicly in the city to crowded audiences. This may well seem surprising to many whose only knowledge of the relations of the Popes to astronomy is the Galileo incident, but it must not be forgotten that Copernicus' great work in which he elaborated his theory, was dedicated, with permission, to the Pope, and not only received no censure until Galileo's time, nearly a century later, but was welcomed as a great contribution to science and thought. It was looked upon as a theory, to be discussed as any other. When Galileo, at the end of the first quarter of the seventeenth century, insisted on teaching it as absolute science, it must not be forgotten that there were no astronomers in Europe who looked upon Copernicanism as an accepted scientific doctrine. Even the reasons advanced by Galileo for its acceptance have all since been rejected. Owing to the discussions of it far and wide in the time of Galileo, certain expressions in Copernicus' great work were required by the Church authorities to be corrected so that his explanation of the heavens should be presented as the theory that it was and not as an absolute doctrine of science.
Toward the end of the sixteenth century the necessity for the correction of the calendar became more urgently manifest and Pope Gregory XIII invited Father Clavius, S.J., to take up the subject. At this time also, as is described by Pope Leo XIII in his Motu Proprio of 1891, "Gregory XIII [nearly half a century before the condemnation of Galileo] ordered a tower to be erected in a convenient part of the Vatican buildings and to be fitted out with {475} the greatest and best instruments of the time. There he held the meetings of the learned men to whom the reform of the calendar had been entrusted. The tower stands to this day a witness to the munificence of its founder. It contains a meridian line by Ignazio Danti of Perugia, with a round marble plate in the centre, adorned with scientific designs. When touched by the rays of the sun that are allowed to enter from above, the designs demonstrate the error of the old reckoning and the correctness of the reform." It was evidently the intention of the Pope that there should be, as a permanent institution in Rome, an astronomical observatory fully equipped and supported by the revenues of the Holy See and with a prominent scientist at its head. This purpose has been constantly kept in mind by the Popes ever since, though not long after Gregory's time, but not at all because of any opposition to science, the observatory founded by him came for more than a century not to be used for the purpose intended because its place was supplied by another Roman institution directly under the patronage of the Popes.
This was the Roman College, the great central school of the Jesuits, in the capital of Christendom. That Order was scarcely fifty years in existence in Pope Gregory XIII's time, yet it was to a member of it that the Pope turned for expert scientific direction in the correction of the calendar. During the next three centuries science as patronized by the Popes in Rome was mainly in the hands of the Jesuits. When it is recalled that this Order is directly under the control of the Pope, the professed members taking a special vow of obedience to him, it will be understood that the Jesuit policy with regard to science must be taken as representing the Papal position in its regard. If it is further recalled that Poggendorff in his Biographical Lexicon of Men Eminent in Science gives the names of some 500 Jesuits, though the Order was not in a position to do any work in science until 1550, it will be readily appreciated that the Popes acted wisely to encourage an institute so prolific in eminent scientists in its scientific work at the Roman College, rather than maintain a separate scientific department at the Vatican. The second institution would only have been unnecessary duplication of staffs and the connection between teaching and research at the Roman College was better for both functions.
Father Christopher Clavius, to whom more than to any other is due the Gregorian reform of the calendar, a magnificent practical application of astronomy and mathematics, is an excellent example {476} of the men who were near the Popes as counsellors and scientific advisers just before Galileo's time. Indeed Galileo and he were on the most friendly terms until his death in 1612. The circle of his friends included such men as Kepler, Tycho-Brahe and other great scientists of his time and he was called "the Euclid of the sixteenth century." His works were published at Mainz, in five huge folio volumes in a collective edition. The third of these is a commentary upon the Sphaera of John Holywood (Joannes de Sacro Bosco, the great medieval mathematician) and a dissertation upon the Astrolabe. The fourth volume contains a very full discussion of Gnomonics, that is, the art of constructing instruments of all kinds for determining the time by means of the sun. The fifth volume contains his papers with regard to the reform of the calendar. Most of these books were issued in many editions before and after his death, and their publication over and over again shows very clearly how much the men of the sixteenth and seventeenth centuries were interested in scientific subjects and how often and quite properly they looked to great clerical teachers as their leaders in science.
Just about the time that the Galileo matter was disturbing scientific and ecclesiastical circles at Rome, Father Scheiner, the Jesuit mathematician and astronomer became Professor of Mathematics in the Roman College. He is the inventor of the pantograph or copying instrument for drawings, and, being of an ingenious inventive disposition, constructed a number of instruments for astronomical investigation. He studied the sun carefully through colored glasses in a helioscope and then conceived the idea of projecting the sun's image on a screen in order to study its surface. Kepler used this same method, but Scheiner is said to have the right of priority in it. In March, 1611, he discovered by this method spots on the sun and while the priority of discovery was disputed by Galileo, three men, Fabricius, Galileo and Scheiner, seem all to have done their work independently in this matter, Fabricius being probably the first in time. For nearly a score of years Father Scheiner continued his observations on the sun and published his great work, which in the fashion of the day was called by the somewhat fantastic title, Rosa Ursina. He had the true scientific spirit and devoted himself to other subjects besides astronomy. He made important researches on the eye, showing that the retina is the seat of vision, and devised the optical experiment which bears his name.
One of Clavius' pupils was Father Matteo Ricci, S.J., founder of the Catholic missions of China, who in the midst of his successful {477} studies of mathematics and astronomy at the Roman College asked, at the age of twenty-five, to be sent on the missions in farthest Asia and was allowed to go the following year. He was selected to found missions in China and succeeded in breaking through the Oriental reserve and contempt for everything Occidental of the Chinese, and thus gained a foothold for Christianity in the country. It was Father Ricci's learning, particularly in cosmology, mathematics, astronomy and geography, that attracted the attention of the Chinese. He introduced astronomical studies at Pekin and brought over a series of instruments for an observatory which were so well thought of that they were preserved until our own time and some of them are said to have been taken from the Chinese capital by the allied troops, after the capture of the city following the Boxer Rebellion. He not only taught the Chinese European science, but he sent back to Europe true accounts of China and, above all, encouraged scientific studies among the missionaries. The example he thus set has always been followed and there has scarcely been a generation since when some Christian missionary has not been making original observations in natural history and collecting curious specimens to be sent home to scientists in Europe, while at the same time faithfully pursuing his missionary work.
Early in the seventeenth century, indeed just at the time when the Galileo case was most prominent at Rome, Father Athanasius Kircher was summoned to Rome and began his scientific work there, which included contributions to every department of physical and even some of the biological sciences. For some five years about the middle of the seventeenth century Father Kircher devoted himself to astronomy and the result was the publication, in 1656, of an astronomical treatise called Iter Celeste. A second volume on astronomy appeared in 1660. Anyone who is inclined to think that these contributions of the great professor of science at the Roman College were only reviews of the passing scientific opinions of the time, is not fully acquainted with Father Kircher's work. He never failed to illuminate anything that he set himself to study. His book on astronomy is of course a text-book, but it is magnificently illustrated; it is a very large work which shows the author's familiarity with the scientific literature of the time, but at the same time reveals his own scientific genius. Father Kircher was encouraged in every way by the Popes and high ecclesiastics of Rome and by his own Order, and his great text-books are among the bibliographic treasures of the history of science. Some idea of {478} his industry may be gathered from the fact that he wrote altogether some forty volumes folio on scientific subjects. He made many original observations, invented a number of valuable scientific instruments that are still in use, among others the vernier and magic lantern, and was productively occupied with nearly every branch of science in his time.
During the eighteenth century, before the suppression of the Jesuits, another distinguished mathematician and astronomer, famous throughout Europe, was working at the Roman College. This was Father Boscovitch, to whom we owe the plans for the erection of an observatory above the great pillars of the Church of the Gesu at Rome, which were not destined to be executed until the middle of the nineteenth century. Boscovitch is famous for a series of important works in mathematics and astronomy. He wrote books on Sun Spots, the Transit of Mercury, the Aurora Borealis, the Figure of the Earth, the Various Effects of Gravity, the Aberration of the Fixed Stars, and other astronomical problems. Pope Benedict XIV commissioned him and his brother Jesuit, Father Le Maire, to carry out several precise meridian arc measurements. He is the inventor of the rock crystal prismatic micrometer, the ring micrometer. After the suppression of the Jesuits Father Boscovitch was made Director of Optics for the Marine, a post created for him in order to secure his services for France.
During the second period of the history of the Vatican Observatory at the end of the eighteenth and the beginning of the nineteenth century, the upper story of the Gregorian tower was fitted up with meteorological and magnetic instruments with a seismograph, a Dolland telescope, a small transit instrument and a pendulum clock and a series of very careful observations on a number of subjects made. From 1800 to 1821 Gilii made an uninterrupted series of meteorological observations, reading the instruments twice a day, at 6 a.m. and 2 p.m. The observations are published for seven years and the rest are preserved as manuscripts in the Vatican Library. There are also deposited astronomical observations of eclipses, comets, Jupiter's satellites and of a transit of Mercury. Gilii laid down the meridian line in front of St. Peter's with the obelisk as a gnomon and the readings of the seasons by the length of the shadow. To him are due also the bronze marks on the floor of St. Peters, giving the comparative lengths of the greatest churches of the world. It was he who placed the first lightning rod on the cupola of St. Peter's. The {479} heavens, the weather, the lightning are supposed often to be set by religiously inclined persons particularly under the care of Providence, to be influenced by prayer, yet these are exactly the three departments of science that were faithfully followed in their detailed scientific aspects during all the centuries by the Papal Astronomers under the patronage and with the approval of the Popes, with the avowed purpose of discovering the natural laws under which they occur.
Two of the distinguished teachers of mathematics and astronomy of the end of the eighteenth century at Rome were Father Thomas Leseur, professor at the Sapienza, and Professor Franz Jacquier, professor at the Roman College, who wrote a commentary on Isaac Newton's Principia which did much to popularize Newton's work.
When, because political influence was brought to bear very strongly on the Pope, the Jesuits were suppressed in 1773, the Roman College passed from their hands and the real reason for allowing the Vatican Observatory on the Papal grounds to fall into disuse was manifest, for the Popes at once took up the question of re-establishing their own observatory. Not long after the suppression we find Monsignor Filippo Luigi Gilii placed in charge of the reorganized Roman Observatory by Cardinal Zelada, who had been appointed Vatican Librarian in 1780, and who found the old Gregorian tower available as a centre of astronomical observation and investigation of which Rome had been deprived since the suppression of the Roman College. After the restoration of the Jesuits early in the nineteenth century, the Roman College was opened once more and distinguished Jesuits, some of them with world-wide reputations, did their work there. With the occupation of Rome by the Italian government in 1870 the Jesuits were banished, the Roman College with its observatory was once more deprived of the learned expert direction of the Fathers of the Order, and once more efforts were made for the re-establishment of a Vatican observatory which is now in existence and under the direction of a Jesuit.
Another of the distinguished scientists of the eighteenth century who taught for a time at Rome was Father Beccaria, whose name is well known in the history of electricity. When not yet forty years of age he was elected a fellow of the Royal Society of London, always a much envied distinction, and as a consequence of his election some of his important papers relating to electricity and various astronomical subjects were sent to the Royal Society {480} and published by them. While no great discovery in physical science is attached to his name, few men did as much as he to awaken enthusiasm and experimental investigation into science in his time. He was one of the pioneers of the great scientific movement of the nineteenth century. Priestley called him one of the most eminent of all the workers in electricity on the Continent, and Professor Chrystal, in his article on electricity, in the Encyclopedia Britannica (ninth edition), gives him an important place. He had been trained to be a professor of experimental physics for his Order, and at this time every one of the teaching orders with colleges at Rome had distinguished men among their faculties.
The well-known astronomer, Father Piazzi, whose discovery of Ceres, the first of the planetoids found in the space between Mars and Jupiter, caused great excitement among astronomers, and whose subsequent work in astronomy brought him membership in many of the scientific academies of Europe, had been for some time a student and a teacher in Rome. While there he was a colleague of Professor Chiaramonti, who later became Pope Pius VII. During all his subsequent brilliant scientific career his special friendship with the Pope continued, and with all his many memberships in scientific bodies he remained a member also of the Theatine religious order which he had entered at a very early age.
After the restoration of the Jesuits the work in the sciences reverted once more to the Jesuits at the Roman College and the Vatican Observatory was discontinued. The interest of the Popes in science, however, was very well illustrated by the apostolic letter of Leo XII, Quod divina sapientia, which gave instructions to all Catholic educational institutions, as to observatories, publications and intercourse with foreign scientists.
The Jesuits at the Roman College reached noteworthy distinction for their astronomical work during the nineteenth century. Father Secchi came to be looked upon as probably one of the most distinguished astronomers in Europe. He received many prizes for his observations, for his invention of instruments and for important discoveries. His work on the sun, published in his book, Le Soleil, represents some of the most important contributions ever made to this department. It was translated into most modern languages. His observations on the corona of the sun during eclipses and especially photographs of the corona, place him among the great original contributors to modern astronomical knowledge. He made a critical examination and classification of the spectra of four thousand stars entailing an enormous amount of {481} work. He believed firmly that it was no use making observations unless they were thoroughly recorded and made available for others. His literary work in astronomy is almost incredible. He sent nearly 700 communications to 42 scientific journals, over 300 of which appeared in the Comptes Rendues and in the Astronomische Nachrichten, the French and German journals of astronomy that are the authoritative records of contemporary scientific work. In this country Newcomb and Langley quote from Secchi frequently and use his illustrations. He was the founder of a new branch of astronomy, Stellar Spectroscopy, and Secchi's types of solar spectra will probably ever remain an essential illustration in astronomical text-books.
Another of the astronomers who did excellent work among the Jesuits at the Roman College during the nineteenth century was Father De Vico, whose determination of the rotation period of Venus and the inclination of its axis was considered so exhaustive that it was not questioned for half a century. He also measured the eccentric position of Saturn in his rings and observed the motions of the two inner moons of this planet which had not been seen before this time except by Herschel. Father De Vico also discovered eight comets, one of them being the well-known comet with a period of rotation of five and a half years which bears his name. Father De Vico and Father Secchi were driven from Rome by the Revolution of 1848, but were brought back to continue their work just as soon as it was possible. In the meantime they continued to be personal friends of successive Popes, encouraged in every way, aided in their work and looked upon as ornaments of the Church. They were thoroughly respected by their Order and there was never the slightest question of any possibility of all their studies in science and all their profound investigation of the deepest scientific subjects disturbing their faith in any way.
One of the well-known contributors to astronomy during the nineteenth century was Father Benedict Sestini, who for his mathematical ability was appointed assistant to Father De Vico of the Roman Observatory. He was banished from Rome with his brother Jesuits by the Revolution of 1848, and taught at Georgetown College, Washington, D. C, for many years. His principal work is his catalogue of star colors, published in the Memoirs of the Roman College, 1845-47. He had very keen vision and fine skill with the brush, so that his catalogue, which embodies the entire B.A.C. Star Catalogue, from the North Pole to thirty degrees south of the equator, will be invaluable for deciding the question {482} whether there are stars variable in color. He made a series of sunspot drawings which were engraved and published as appendix A of the United States Naval Observatory volume for 1847, printed in 1853. He was the teacher of mathematics and astronomy to the American Jesuit students and wrote a series of text-books for that purpose.
As we have said, the Italian government suppressed the Roman College, declaring it State property and this prevented further work in the observatory there, which had been for nearly half a century under Father Secchi and Father De Vico, one of the most important centres in the world of astronomical advance. Beggared by the Roman confiscations which compelled the Popes to cut off all their support of scientific and educational work except what related closely to clerical education, it was not until 1888 that Pope Leo XIII found himself in a position to re-establish a Roman observatory in connection with the Vatican. In 1888 the Italian clergy, for the celebration of the Golden Jubilee of Pope Leo XIII, presented to him, knowing from his interest in science how agreeable such a gift would be to him, a collection of astronomical instruments and the Gregorian tower was selected once more for its former purposes and the Barnabite, Father Denza, the well-known founder of the Italian Meteorological Society, became the official head. Pope Leo XIII ceded to the Vatican Observatory a second tower more than 400 metres distant from the Gregorian. As this was of immense strength, the lower walls being some five yards in thickness, it seemed strong and firm enough to support the thirteen-inch photographic refractor which was ordered from Gauthier. Seven volumes of observations were published during the next fifteen years, four under Father Denza, a fifth under Father Lais and the last two under Father Rodriguez, an Augustinian, who was a specialist in meteorology.
The last Pope, Pius X, encouraged the Vatican Observatory in every way. The Gregorian tower being near the Vatican Library and too distant from the observatory was restored to its original library purpose and given over to the housing of the collection of Historical Archives. The second round tower of the old Leonine Fortress, together with the adjoining summer residence of Leo XIII, was devoted to astronomical work. Father Hagan, S.J., who had been distinguished for mathematical studies in connection with astronomy here in America, was chosen as the director, and there has been a magnificent development of the astronomical work. There is a new sixteen-inch visual telescope in the second tower, {483} called the Torre Pio X. There are four rotary domes covering the astrographic refractor in the Leonine Tower, and some excellent work is being accomplished. Every encouragement is given to it as far as the limited means of the Pope will permit, and a fine library is being collected for future workers.