Toward the close of August I became interested in the late singing of several whippoorwills, and so was taken away from the robins' haunt at the hour of sunset. Then, from the 5th to the 13th of September, I was absent from home. On the night of my return I went to the shore of the pond, where, on the 1st of August, I had counted 1533 entries. The weather was favorable, and I arrived in good season and remained till the stars came out, but I counted only 137 robins! It was plain that the great majority of the congregation had departed.

As I have said, there was little to be learned by going into the wood after the robins were assembled. Nevertheless I used frequently to intrude upon them, especially as friends or neighbors, who had heard of my "discovery," were desirous to see the show. The prodigious cackling and rustling overhead seemed to make a deep impression upon all such visitors, while, for myself, I should have had no difficulty in crediting the statement had I been told that ten thousand robins were in the treetops. One night I took two friends to the place after it was really dark. All was silent as we felt our way among the trees, till, suddenly, one of the trio struck a match and kindled a blaze of dry twigs. The smoke and flame speedily waked the sleepers; but even then they manifested no disposition to be driven out.

For curiosity's sake, I paid one early morning visit to the roost, on the 30th of July. It would be worth while, I thought, to see how much music so large a chorus would make, as well as to note the manner of its dispersion. To tell the truth, I hoped for something spectacular,—a grand burst of melody, and then a pouring forth of a dense, uncountable army of robins. I arrived about 3.40 (it was still hardly light enough to show the face of the watch), and found everything quiet. Pretty soon the robins commenced cackling. At 3.45 a song sparrow sang, and at the same moment I saw a robin fly out of the wood. Five minutes later a robin sang; at 3.55 another one flew past me; at four o'clock a few of the birds were in song, but the effect was not in any way peculiar,—very much as if two or three had been singing in the ordinary manner. They dispersed precisely as I had seen them gather: now a single bird, now two or three, now six, or even ten. A casual passer along the road would have remarked nothing out of the common course. They flew low,—not as if they were starting upon any prolonged flight,—and a goodly number alighted for a little in the field where I was standing. Shortly before sunrise I went into the wood and found it deserted. The robin is one of our noisiest birds. Who would have believed that an assembly of thousands could break up so quietly? Their behavior in this regard may possibly have been influenced by prudential considerations. I have said that many of them seemingly took pains to approach the roost indirectly and under cover. On the westerly side, for example, they almost invariably followed a line of bushes and trees which runs toward the roost along the edge of the meadow, even though they were obliged sharply to alter their course in so doing.

All this time I had been in correspondence with my friend before referred to, who was studying a similar roost,[15] —in Belmont,—which proved to be more populous than mine, as was to be expected, perhaps, the surrounding country being less generally wooded. It was a mile or more from his house, which was so situated that he could sit upon his piazza in the evening and watch the birds streaming past. On the 11th of August he counted here 556 robins, of which 336 passed within five minutes. On the 28th he counted 1180, of which 456 passed within five minutes,—ninety-one a minute! On the 2d of September, from a knoll nearer the roost, he counted 1883 entries.

This gathering, like the one in Melrose, was greatly depleted by the middle of September. "Only 109 robins flew over the place to-night," my correspondent wrote on the 25th, "against 538 September 4th, 838 August 30th, and 1180 August 28th." Two evenings later (September 27th) he went to the neighborhood of the roost, and counted 251 birds,—instead of 1883 on the 2d. Even so late as October 9th, however, the wood was not entirely deserted. During the last month or so of its occupancy, the number of the birds was apparently subject to sudden and wide fluctuations, and it seemed not unlikely that travelers from the north were making a temporary use of the well-known resort. It would not be surprising if the same were found to be true in the spring. In April, 1890, I saw some things which pointed, as I thought, in this direction, but I was then too closely occupied to follow the matter.

How early in the season does this nightly flocking begin? This question often presented itself. It was only the middle of July when the Cambridge roost was found in full operation, though at that time many robins must still have had family duties, and some were probably building new nests. Next summer, we said, we would try to mark the beginnings of the congregation.

My own plans to this end came near being thwarted. In December I was dismayed to see the owner of the wood cutting it down. Happily some kind power stayed his hand when not more than a third of the mischief was done, and on the 29th of June, 1890, while strolling homeward along the highway, listening to the distant song of a veery, I noticed within five or ten minutes seventeen robins making toward the old rendezvous. On the following evening I stood beside the ice-pond and saw one hundred and ninety-two robins enter the wood. The flight had begun before my arrival, and was not entirely over when I came away. Evidently several hundreds of the birds were already passing their nights in company. In my ignorance, I was surprised at the early date; but when I communicated my discovery to the Belmont observer, he replied at once that he had noticed a movement of the same kind on the 11th of June. The birds, about a dozen, were seen passing his house.

Thinking over the matter, I began to ask myself—though I hesitate about making such a confession—whether it might not be the adult males who thus unseasonably went off to bed in a crowd, leaving their mates to care for eggs and little ones. At this very moment, as it happened, I was watching with lively sympathy the incessant activities of a female humming-bird, who appeared to be bringing up a family (two very hungry nestlings), with no husband to lift a finger for her assistance; and the sight, as I fear, put me into a cynical mood. Male robins were probably like males in general,—lovers of clubs and shirkers of home duties. Indeed, a friend who went into the roost with me, one evening, remarked upon the continual cackling in the treetops as "a very social sound;" and upon my saying something about a sewing circle, he answered, quite seriously, "No, it is rather like a gentleman's club." But it would have been unscientific, as well as unchristian, to entertain an hypothesis like this without putting its soundness to some kind of test. I adopted the only plan that occurred to me,—short of rising at half past two o'clock in the morning to see the birds disperse. I entered the wood just before the assemblage was due (this was on the 9th of July), and took a sheltered position on the eastern edge, where, as the robins flew by me, or alighted temporarily in the trees just across the brook, they would have the sunlight upon their breasts. Here, as often as one came sufficiently near and in a sufficiently favorable light, I noted whether it was an adult, or a streaked, spotted bird of the present season. As a matter of course, the number concerning which this point could be positively determined under such conditions was very small,—only fifty-seven altogether. Of these, forty-nine were surely birds of the present summer, and only eight unmistakable adult males. If any adult females came in, they passed among the unidentified and uncounted. [16] I was glad I had made the test. As a kind-hearted cynic (I confess to being nothing worse than this), I was relieved to find my misanthropic, or, to speak more exactly, my misornithic, notions ill founded. As for the sprinkling of adult males, they may have been, as a "friend and fellow woodlander" suggests, birds which, for one reason or another, had taken up with the detestable opinion that "marriage is a failure."

During the month of July, 1890, I made frequent counts of the entries at the eastern end of the roost, thinking thus to ascertain in a general way the rate at which its population increased. On the whole, the growth proved to be fairly steady, in spite of some mysterious fluctuations, as will be seen by the following table:—

After July 6th all the enumerations were made with the help of another man, though we stood side by side, and covered no more ground than I had hitherto attempted to compass alone. The figures of the 27th were far in excess of any obtained in 1889, and for a day I was disposed to take seriously the suggestion of a friend that some other roost must have been broken up and its members turned into the Melrose gathering. But on the evening of the 28th I tried a count by myself, and made only 1517 birds! The conditions were favorable, and the robins came, as they had come the night before, in flocks, almost in continuous streams. The figures had fallen off, not because there were fewer birds, but because I was unable to count them. They were literally too many for me. The difficulties of the work, it should be explained, are greatly enhanced by the fact that at the very corner where the influx is largest none of the low-flying birds can be seen except for a second or two, as they dart across a bit of sky between the roost and an outlying wood. To secure anything like a complete census, this point must be watched continuously; and meantime birds are streaming in at the other corner and shooting over the distracted enumerator's head, and perhaps dropping out of the sky. I conclude, therefore, not that the roost had increased in population, but that my last year's reckoning was even more inadequate than I then supposed. Even with two pairs of eyes, it is inevitable that multitudes of birds should pass in unnoticed, especially during the latter half of the flight. I have never had an assistant or a looker-on to whom this was not perfectly apparent.

As I stood night after night watching the robins stream into this little wood,—no better, surely, than many they had passed on their way,—I asked myself again and again what could be the motive that drew them together. The flocking of birds for a long journey, or in the winter season, is less mysterious. In times of danger and distress there is no doubt a feeling of safety in a crowd. But robins cannot be afraid of the dark. Why, then, should not each sleep upon its own feeding grounds, alone, or with a few neighbors for company, instead of flying two or three miles, more or less, twice a day, simply for the sake of passing the night in a general roost?

Such questions we must perhaps be content to ask without expecting an answer. By nature the robin is strongly gregarious, and though his present mode of existence does not permit him to live during the summer in close communities,—as marsh wrens do, for example, and some of our swallows,—his ancestral passion for society still asserts itself at nightfall. Ten or twelve years ago, when I was bird-gazing in Boston, there were sometimes a hundred robins at once about the Common and Garden, in the time of the vernal migration. By day they were scattered over the lawns; but at sunset they gathered habitually in two or three contiguous trees, not far from the Frog Pond and the Beacon Street Mall (I wonder whether the same trees are still in use for the same purpose), where, after much noise and some singing, they retired to rest,—if going to sleep in a leafless treetop can be called retiring.

Whatever the origin and reason of this roosting habit, I have no doubt that it is universal. Middlesex County birds cannot be in any respect peculiar. Whoever will keep a close eye upon the robins in his neighborhood, in July and August, will find them at sunset flocking to some general sleeping-place.

It would be interesting to know how far they travel at such times. The fact that so many hundreds were to be seen at a point more than a mile away from the Belmont roost is significant; but I am not aware that any one has yet made a study of this part of the subject. My own birds seemed to come, as a rule, by easy stages. In the long narrow valley east of the roost, where I oftenest watched their approach, they followed habitually—not invariably—a zigzag route, crossing the meadow diagonally, and for the most part alighting for a little upon a certain wooded hill, whence they took a final flight to their nightly haven, perhaps a quarter of a mile beyond. Farther down the valley, a mile or more from the roost, birds were to be seen flying toward it, but I found no place at which a general movement could be observed and large numbers counted.

As to the size of these nightly gatherings, it seems wisest not to guess; though, treating the subject in this narrative manner, I have not scrupled to mention, simply as a part of the story, some of my temporary surmises. What I am told of the Belmont wood is true also of the one in Melrose: its shape and situation are such as to make an accurate census impossible, no matter how many "enumerators" might be employed. It could be surrounded easily enough, but it would be out of the question to divide the space among the different men so that no two of them should count the same birds. At present it can only be said that the robins are numbered by thousands; in some cases, perhaps, by tens of thousands.

THE PASSING OF THE BIRDS.

By the first of August the bird-lover's year is already on the wane. In the chestnut grove, where a month ago the wood thrush, the rose-breasted grosbeak, and the scarlet tanager were singing, the loiterer now hears nothing but the wood pewee's pensive whistle and the sharp monotony of the red-eyed vireo. The thrasher is silent in the berry pasture, and the bobolink in the meadow. The season of jollity is over. Orioles, to be sure, after a month of silence, again have fits of merry fifing. The field sparrow and the song sparrow are still in tune, and the meadow lark whistles, though rarely. Catbirds still practice their feeble improvisations and mimicries in the thickets along the brooksides as evening comes on, and of the multitudes of robins a few are certain to be heard warbling before the day is over. Goldfinches have grown suddenly numerous, or so it seems, and not infrequently one of them breaks out in musical canary-like twitterings. On moonlight evenings the tremulous, haunting cry of the screech-owl comes to your ears, always from far away, and if you walk through the chestnut grove aforesaid in the daytime you may chance to catch his faint, vibratory, tree-frog whistle. For myself, I never enter the grove without glancing into the dry top of a certain tall tree, to see whether the little rascal is sitting in his open door. More than half the time he is there, and always with his eye on me. What an air he has!—like a judge on the bench! If I were half as wise as he looks, these essays of mine would never more be dull. For his and all other late summer music let us be thankful; but it is true, nevertheless, that the year is waning. How short it has been! Only the other day the concert opened, and already the performers are uneasy to be gone. They have crowded so much into so brief a space! The passion of a life-time into the quarter of a year! They are impatient to be gone, I say; but who knows how many of them are gone already? Where are the blue golden-winged warblers that sang daily on the edge of the wood opposite my windows, so that I listened to them at my work? I have heard nothing of their rough dsee, dsee since the 21st of June, and in all that time have seen them but once—a single bird, a youngling of the present year, stumbled upon by accident while pushing my way through a troublesome thicket on the first day of August. Who knows, I say, how many such summer friends have already left us? An odd coincidence, however, warns me at this very moment that too much is not to be made of merely negative experiences; for even while I was penciling the foregoing sentence about the blue golden-wing there came through the open window the hoarse upward-sliding chant of his close neighbor, the prairie warbler. I have not heard that sound before since the 6th of July, and it is now the 22d of August. The singers had not gone, I knew; I saw several of them (and beautiful creatures they are!) a few days ago among the pitch pines; but why did that fellow, after being dumb for six or seven weeks, pipe up at that precise moment, as if to punctuate my ruminations with an interrogation point? Does he like this dog-day morning, with its alternate shower and sunshine, and its constant stickiness and heat? In any case I was glad to hear him, though I cannot in the spirit of veracity call him a good singer. Whist! There goes an oriole, a gorgeous creature, flashing from one elm to another, and piping in his happiest manner as he flies. It might be the middle of May, to judge from his behavior. He likes dog-day weather, there can be no question of that, however the rest of the world may grumble.

This is a time when one sees many birds, but few species. Bluebirds are several times as abundant as in June. The air is sweet with their calls at this moment, and once in a while some father of the flock lets his happiness run over in song. One cannot go far now without finding the road full of chipping sparrows, springing up in their pretty, characteristic way, and letting the breeze catch them. The fences and wayside apple-trees are lively with kingbirds and phœbes. I am already watching the former with a kind of mournful interest. In ten days, or some such matter, we shall have seen the last of their saucy antics. Gay tyrants! They are among the first birds of whom I can confidently say, "They are gone;" and they seem as wide-awake when they go as when they come. Being a man, I regret their departure; but if I were a crow, I think I should be for observing the 31st of August as a day of annual jubilee.

A few years ago, in September, I saw the white-breasted swallows congregated in the Ipswich dunes,—a sight never to be forgotten. On the morning of the 9th, the fourth day of our visit, a considerable flock—but no more, perhaps, than we had been seeing daily—came skimming over the marshes and settled upon a sand-bar in the river, darkening it in patches. At eight o'clock, when we took the straggling road out of the hills, a good many—there might be a thousand, I guessed—sat, upon the fence wires, as if resting. We walked inland, and on our return, at noon, found, as my notes of the day express it, "an innumerable host, thousands upon thousands," about the landward side of the dunes. Fences and haycocks were covered. Multitudes were on the ground,—in the bed of the road, about the bare spots in the marsh, and on the gray faces of the hills. Other multitudes were in the bushes and low trees, literally loading them. Every few minutes a detachment would rise into the air like a cloud, and anon settle down again. As we stood gazing at the spectacle, my companion began chirping at a youngster who sat near him on a post, as one might chirp to a caged canary. The effect was magical. The bird at once started toward him, others followed, and in a few seconds hundreds were flying about our heads. Round and round they went, almost within reach, like a cloud of gnats. "Stop! stop!" cried my companion; "I am getting dizzy." We stopped our squeakings, and the cloud lifted; but I can see it yet. Day after day the great concourse remained about the hills, till on the 13th we came away and left them. The old lighthouse keeper told me that this was their annual rendezvous. He once saw them circle for a long time above the dunes, for several hours, if I remember right, till, as it seemed, all stragglers had been called in from the beach, the marsh, and the outlying grassy hills. Then they mounted into the sky in a great spiral till they passed out of sight; and for that year there were no more swallows. This, he insisted, took place in the afternoon, "from three to four o'clock." He was unquestionably telling a straightforward story of what he himself had seen, but his memory may have been at fault; for I find it to be the settled opinion of those who ought to know, that swallows migrate by day and not by night, while the setting out of a great flock late in the afternoon at such a height would seem to indicate a nocturnal journey. Morning or evening, I would give something to witness so imposing a start.

The recollection of this seaside gathering raises anew in my mind the question why, if swallows and swifts migrate exclusively in the daytime, we so rarely see anything of them on the passage. Our Ipswich birds were all tree swallows,—white-breasted martins,—and might fairly be supposed to have come together from a comparatively limited extent of country. But beside tree swallows there are purple martins, barn swallows, sand martins, cliff swallows, and chimney swifts, all of which breed to the northward of us in incalculable numbers. All of them go south between the middle of July and the first of October. But who in New England has ever seen any grand army of them actually on the wing? Do they straggle along so loosely as to escape particular notice? If so, what mean congregations like that in the Ipswich dunes? Or are their grand concerted flights taken at such an altitude as to be invisible?

On several afternoons of last September, this time in an inland country, I observed what might fairly be called a steady stream of tree swallows flying south. Twice, while gazing up at the loose procession, I suddenly became aware of a close bunch of birds at a prodigious height, barely visible, circling about in a way to put a count out of the question, but evidently some hundreds in number. On both occasions the flock vanished almost immediately, and, as I believed, by soaring out of sight. The second time I meant to assure myself upon this point, but my attention was distracted by the sudden appearance of several large hawks within the field of my glass, and when I looked again for the swallows they were nowhere to be seen. Were the stragglers which I had for some time been watching, flying high, but well within easy ken, and these dense, hardly discernible clusters—hirundine nebulæ, as it were—were all these but parts of one innumerable host, the main body of which was passing far above me altogether unseen? The conjecture was one to gratify the imagination. It pleased me even to think that it might be true. But it was only a conjecture, and meantime another question presented itself.

When this daily procession had been noticed for two or three afternoons, it came to me as something remarkable that I saw it always in the same place, or rather on the same north and south line, while no matter where else I walked, east or west, not a swallow was visible. Had I stumbled upon a regular route of swallow migration? It looked so, surely; but I made little account of the matter till a month afterward, when, in exactly the same place, I observed robins and bluebirds following the same course. The robins were seen October 26th, in four flocks, succeeding each other at intervals of a few minutes, and numbering in all about 130 birds. They flew directly south, at a moderate height, and were almost certainly detachments of one body. The bluebird movement was two days later, at about the same hour, the morning being cold, with a little snow falling. This time, too, as it happened, the flock was in four detachments. Three of these were too compact to be counted as they passed; the fourth and largest one was in looser order and contained a little more than a hundred individuals. In all, as well as I could guess, there might have been about three hundred birds. They kept a straight course southward, flying high, and with the usual calls, which, in autumn at least, always have to my ears a sound of farewell. Was it a mere coincidence that these swallows, bluebirds, and robins were all crossing the valley just at this point?

This question, too, I count it safer to ask than to answer, but all observers, I am sure, must have remarked so much as this,—that birds, even on their migrations, are subject to strong local preferences. An ornithologist of the highest repute assures me that his own experience has convinced him so strongly of this fact that if he shoots a rare migrant in a certain spot he makes it a rule to visit the place again a year afterward on the same day, and, if possible, at the same hour of the day. Another friend sends me a very pretty story bearing upon the same point. The bird of which he speaks, Wilson's black-cap warbler, is one of the less common of our regular Massachusetts migrants. I count myself fortunate if I see two or three specimens during its spring or autumn passage. My correspondent shall tell the story for himself.

"While I was making the drawings for the 'Silva,' at the old Dwight house, I was in the habit of taking a turn every pleasant day in the gardens after my scanty lunch. On the 18th of May, 1887, in my daily round I saw a Wilson's black-cap for the first time in my life. He was in a bush of Spiræa media, which grew in the midst of the rockery, and allowed me to examine him at near range with no appearance of fear. Naturally I made a note of the occurrence in my diary, and talked about it with my family when I got home. The seeing of a new bird always makes a red-letter day.

"The next spring, as I was looking over my notebook of the previous year, I came upon my entry of May 18th, and thought I would be on the lookout for a black-cap on that date. Several times during the morning I thought of the matter, and after my lunch I sauntered into the rockery just as I had done the year before. Imagine my start when there, in the very same bush, was the black-cap peering at me; and I found on looking at my watch that it was precisely the same hour,—half past one! I rubbed my eyes and pinched myself to make sure it was not a dream. No, it was all real. Of course, I thought the coincidence very singular, and talked about it, not only with my family, but also with other people. You must remember that I had never seen the bird elsewhere.

"Well, another spring came round. The 18th of May was fixed in my mind, and I thought many times of my black-cap (I called it my black-cap now), and wondered if it would keep tryst again. On the morning of the 18th, the first thing I thought of when I awoke was my black-cap. That forenoon I actually felt nervous as the time approached, for I felt a sort of certainty (you smile) that I should see my bird again. My lunch was hastier than usual, and I was about to sally forth when it flashed across me—'Suppose the bird should be there again, who would believe my story? Hold! I will have a witness.' I called to Mr. J——, who was at work upstairs, and after explaining what I wanted, invited him to accompany me. We cautiously entered the rockery, and within a few minutes there flitted from a neighboring thicket into that very Spiræa bush my black-cap! I took out my watch. It was just half past one!"

My own experiences in this kind have been much less striking and dramatic than the foregoing, but I may add that a few years ago I witnessed the vernal migration in a new piece of country—ten miles or so from my old field—and found myself at a very considerable disadvantage. I had never realized till then how much accustomed I had grown to look for particular birds in particular places, and not in other places of a quite similar character.

I speak of witnessing a migration; but what we see for the most part (ducks and geese being excepted) is not the actual movement northward or southward. We see the stragglers, more or less numerous, that happen to have dropped out of the procession in our immediate neighborhood,—a flock of sandpipers about the edge of the pond, some sparrows by the roadside, a bevy of warblers in the wood,—and from these signs we infer the passing of the host.

Unlike swallows, robins, bluebirds, blackbirds, and perhaps most of the sparrows, our smaller wood birds, the warblers and vireos especially, appear to move as a general thing in mixed flocks. Whenever the woods are full of them, as is the case now and then every spring and fall, one of the most striking features of the show is the number of species represented. For the benefit of readers who may never have observed such a "bird wave," or "rush," let me sketch hastily one which occurred a few years ago, on the 22d of September. As I started out at six o'clock in the morning, in a cool northwest wind, birds were passing overhead in an almost continuous stream, following a westerly course. They were chiefly warblers, but I noted one fairly large flock of purple finches. All were at a good height, and the whole movement had the air of a diurnal migration. I could only conjecture that it was the end of the nocturnal flight, so far, at least, as the warblers were concerned; in other words, that the birds, on this particular occasion, did not finish their nightly journey till a little after sunrise. But if many were still flying, many others had already halted; for presently I came to a piece of thin, stunted wood by the roadside, and found in it a highly interesting company. Almost the first specimen I saw was a Connecticut warbler perched in full view and exposing himself perfectly. Red-bellied nuthatches were calling, and warblers uncounted were flitting about in the trees and underbrush. A hurried search showed black-polls, black-throated greens, blue yellow-backs, one redstart, one black-and-white creeper, one Blackburnian, one black-and-yellow, one Canadian flycatcher (singing lustily), one yellow redpoll, and one clearly-marked bay-breast. The first yellow-bellied woodpecker of the season was hammering in a tree over my head, and not far away was the first flock of white-throated sparrows. After breakfast I passed the place again, and the only bird to be found was one phœbe! Within half a mile of the spot, however, I came upon at least three goodly throngs, including scarlet tanagers (all in yellow and black), black-throated blue warblers, pine warblers, olive-backed and gray-cheeked thrushes, a flock of chewinks (made up exclusively of adult males, so far as I could discover), red-eyed vireos, one solitary vireo, brown thrashers, with more redstarts, a second Blackburnian, and a second black-and-yellow. Every company had its complement of chickadees. Of the morning's forty species, thirteen were warblers; and of these thirteen, four were represented by one specimen each. For curiosity's sake I may add that a much longer walk that afternoon, through the same and other woods, was utterly barren. Except for two or three flocks of white-throated sparrows; there was no sign whatever that the night before had brought us a "flight."

Autumnal ornithology may almost be called a science by itself. Not only are birds harder to find (being silent) and harder to recognize in autumn than in spring, but their movements are in themselves more difficult of observation. A few years of note-taking will put one in possession of the approximate dates of arrival of all our common vernal migrants. Every local observer will tell you when to look for each of the familiar birds of his neighborhood; but he will not be half so ready with information as to the time of the same birds' departure. Ask him about a few of the commonest,—the least flycatcher and the oven-bird, or the golden warbler and the Maryland yellow-throat. He will answer, perhaps, that he has seen Maryland yellow-throats in early October, and golden warblers in early September; but he will very likely add that these were probably voyagers from the North, and that he has never made out just when his own summer birds take their leave.

After the work of nidification is over, birds as a rule wander more or less from their breeding haunts; and even if they do not wander they are likely to become silent. If we miss them, therefore, we are not to conclude as a matter of course that they have gone south. Last year, during the early part of the season, cuckoos were unusually plentiful, as it seemed to me. Then I discovered all at once that there were none to be found. After the first of July I neither saw nor heard a cuckoo of either species! Had they moved away? I do not know; but the case may be taken as an extreme illustration of the uncertainty attaching to the late-summer doings of birds in general. Every student must have had experiences of a sort to make him slow to dogmatize when such points are in question. Throughout May and June, for example, he has heard and seen wood thrushes in a certain grove. After that, for a whole month, he hears and sees nothing, though he is frequently there. The thrushes have gone? So it would seem. But then, suddenly, they are singing again in the very same trees, and he is forced to conclude that they have not been away, but during their period of midsummer silence have eluded his notice. On the whole, therefore, after making allowance for particular cases in which we may have more precise information, it would be hard, I think, to say just when our nocturnal travelers set out on their long journey. As the poet prayed Life to do,—

Their departure bereaves us, but, all in all, it must be accounted a blessing. Like the falling of the leaves, it touches the heart with a pleasing sadness,—a sadness more delicious, if one is born to enjoy it, than all the merry-making of springtime. And even for the most unsentimental of naturalists the autumnal season has many a delightful hour. The year is almost done; but for the moment the whole feathered world is in motion, and the shortest walk may show him the choicest of rarities. Thanks to the passing of the birds, his local studies are an endless pursuit. "It is now more than forty years that I have paid some attention to the ornithology of this district, without being able to exhaust the subject," says Gilbert White; "new occurrences still arise as long as any inquiries are kept alive." A happy man is the bird-lover; always another species to look for, another mystery to solve. His expectations may never be realized; but no matter; it is the hope, not its fulfillment, that makes life worth having. How can any New Englander imagine that he has exhausted the possibilities of existence so long as he has never seen the Lincoln finch and the Cape May warbler?

But "I speak as a fool." Our happiness, if we are bird-lovers indeed, waits not upon novelties and rarities. All such exceptional bits of private good fortune let the Fates send or withhold as they will. The grand spectacle itself will not fail us. Even now, through all the northern country, the procession is getting under way. For the next three months it will be passing,—millions upon millions: warblers, sparrows, thrushes, vireos, blackbirds, flycatchers, wrens, kinglets, woodpeckers, swallows, humming-birds, hawks; with sandpipers, plovers, ducks and geese, gulls, and who knows how many more? Night and day, week days and Sundays, they will be flying: now singly or in little groups, and flitting from one wood or pasture to another; now in great companies, and with protracted all-day or all-night flights. Who could ask a better stimulus for his imagination than the annual southing of this mighty host? Each member of it knows his own time and his own course. On such a day the snipe will be in such a meadow, and the golden plover in such a field. Some, no doubt, will lose their way. Numbers uncounted will perish by storm and flood; numbers more, alas, by human agency. As I write, with the sad note of a bluebird in my ear, I can see the sea-beaches and the marshes lined with guns. But the army will push on; they will come to their desired haven; for there is a spirit in birds, also, "and the inspiration of the Almighty giveth them understanding."

A GREAT BLUE HERON.

"Why appear you with this ridiculous boldness?"
Shakespeare.

The watcher of birds in the bush soon discovers that they have individual as well as race characteristics. They are not things, but persons,—beings with intellect, affections, and will,—and a strong specific resemblance is found to be consistent with no small measure of personal variation. All robins, we say, look and act alike. But so do all Yankees; yet it is part of every Yankee's birthright to be different from every other Yankee. Nature abhors a copy, it would seem, almost as badly as she abhors a vacuum. Perhaps, if the truth were known, a copy is a vacuum.

I walked down the bay shore of Cape Cod one summer morning, and at a certain point climbed the steep cliff to the railway track, meaning to look into a large cranberry meadow where, on previous visits, I had found a few sandpipers and plovers. Near one end of the perfectly level, sand-covered meadow was a little pool, and my first glance in that direction showed me a great blue heron wading about its edge. With as much quietness as possible I stole out of sight, and then hastened up the railway through a cut, till I had the sun at my back and a hill between me and the bird. Then I began a stealthy approach, keeping behind one object after another, and finally going down flat upon the ground (to roll in the soil is an excellent method of cleansing one's garments on Cape Cod) and crawling up to a patch of bayberry bushes, the last practicable cover.

Here let me say that the great blue heron is, as its name implies, a big bird, standing almost as high as an ordinary man, and spreading its wings for nearly or quite six feet. Its character for suspiciousness may be gathered from what different writers have said about it. "He is most jealously vigilant and watchful of man," says Wilson, "so that those who wish to succeed in shooting the heron must approach him entirely unseen, and by stratagem." "Extremely suspicious and shy," says Audubon. "Unless under very favorable circumstances, it is almost hopeless to attempt to approach it. To walk up towards one would be a fruitless adventure." Dr. Brewer's language is to the same effect,—"At all times very vigilant and difficult of approach."

This, then, was the bird which I now had under my field-glass, as I lay at full length behind the friendly bayberry bushes. Up to this point, for aught that appeared, he was quite unaware of my espionage. Like all the members of his family that I have ever seen, he possessed so much patience that it required much patience to watch him. For minutes together he stood perfectly still, and his movements, as a rule, were either so slow as to be all but imperceptible, or so rapid as almost to elude the eye. Boys who have killed frogs—which was pretty certainly my heron's present employment—will need no explanation of his behavior. They know very well that, if the fatal club is to do its work, the slowest kind of preliminary motion must be followed by something like a flash of lightning.

I watched the bird for perhaps half an hour, admiring his handsome blue wings as now and then he spread them, his dainty manner of lifting his long legs, and the occasional flashing stroke of his beak. My range was short (for a field-glass, I mean), and, all in all, I voted it "a fine show."

When I wearied of my position I rose and advanced upon the heron in full sight, expecting every moment to see him fly. To my astonishment he held his ground. Down the hillside I went, nearer and nearer, till I came to a barbed-wire fence, which bounded the cranberry field close by the heron's pool. As I worried my way through this abominable obstruction, he stepped into a narrow, shallow ditch and started slowly away. I made rapidly after him, whereupon he got out of the ditch and strode on ahead of me. By this time I was probably within twenty yards of him, so near that, as he twisted his long neck every now and then, and looked at me through his big yellow eyes, I began to wonder whether he might not take it into his head to turn the tables upon me. A stab in the face with that ugly sharp beak would have been no laughing matter; but I did not believe myself in any danger, and quickened my steps, being now highly curious to see how near the fellow I could get. At this he broke into a kind of dog-trot, very comical to witness, and, if I had not previously seen him fly a few yards, I should have supposed him disabled in the wing. Dr. Brewer, by the way, says that this bird is "never known to run, or even to walk briskly;" but such negative assertions are always at the maker's risk.

He picked up his legs at last, for I pressed him closer and closer, till there could not have been more than forty or fifty feet between us; but even then he settled down again beside another pool, only a few rods further on in the same meadow, and there I left him to pursue his frog-hunt unmolested. The ludicrousness of the whole affair was enhanced by the fact, already mentioned, that the ground was perfectly flat, and absolutely without vegetation, except for the long rows of newly planted cranberry vines. As to what could have influenced the bird to treat me thus strangely, I have no means of guessing. As we say of each other's freaks and oddities, it was his way, I suppose. He might have behaved otherwise, of course, had I been armed; but of that I felt by no means certain at the time, and my doubts were strengthened by an occurrence which happened a month or so afterward.

I was crossing the beach at Nahant with a friend when we stole upon a pair of golden plovers, birds that both of us were very happy to see. The splendid old-gold spotting of their backs was plain enough; but immature black-bellied plovers are adorned in a similar manner, and it was necessary for us to see the rumps of our birds before we could be sure of their identity. So, after we had scrutinized them as long as we wished, I asked my companion to put them up while I should keep my glass upon their backs and make certain of the color of their rumps as they opened their wings. We were already within a very few paces of them, but they ran before him as he advanced, and in the end he had almost to tread on them.

The golden plover is not so unapproachable as the great blue heron, I suppose, but from what sportsmen tell me about him I am confident that he cannot be in the habit of allowing men to chase him along the beach at a distance of five or six yards. And it is to be added that, in the present instance, my companion had a gun in his hand.

Possibly all these birds would have behaved differently another day, even in what to us might have seemed exactly the same circumstances. Undoubtedly, too, it is easier, as an almost universal rule, to approach one or two birds than a considerable flock. In the larger body there are almost certain to be a few timorous souls,—a few wider-awake and better instructed souls, let us rather say,—who by their outcries and hasty flight will awaken all the others to a sense of possible danger. But it is none the less true, as I said to begin with, that individual birds have individual ways. And my great blue heron, I am persuaded, was a "character." It would be worth something to know what was passing behind those big yellow eyes as he twisted his neck to look once more at the curious fellow—curious in two senses—who was keeping after him so closely. Was the heron curious, as well as his pursuer? Or was he only a little set in his own way; a little resentful of being imposed upon; a little inclined to withstand the "tyrant of his fields," just for principle's sake, as patriots ought to do? Or was he a young fellow, in whom heredity had mysteriously omitted to load the bump of caution, and upon whom experience had not yet enforced the lesson that if a creature is taller and stronger than you are, it is prudent to assume that he will most likely think it a pleasant bit of sport to kill you? It is nothing to the credit of humankind that the sight of an unsuspicious bird in a marsh or on the beach should have become a subject for wonder.