There are several disorders about the navel, concerning which, because they are very uncommon, authors are not agreed. Now it is probable, that each one omitted what he had not met with, and that none of them feigned a disease he had not seen. An indecent prominence of the navel is common to them all. The question is, what are its causes? Meges has assigned three; that sometimes the intestine makes its way into that part, sometimes the omentum, at other times a humour. Sostratus has not mentioned the omentum. To the other two he has added, that flesh sometimes grows there; which is sometimes sound, at other times of a cancerous nature. Gorgias also has omitted the omentum, but allowing the other three causes, says, that air too sometimes is forced into this part. Heron has mentioned all these four, and the omentum too; and that species also, in which there is both the omentum and the intestine.

The following symptoms discover what species it is. When the intestine is protruded, the tumour is neither hard nor soft; is lessened by cold, increases not only by heat, but even by keeping in the breath; sometimes it sounds; and when a person lies on his back, the intestine returns of itself, and the swelling subsides. When it is the omentum, the other symptoms are similar, but the tumour is softer, and from its base, tapers towards the top; and if one takes hold of it, it slips away. Where both these are together, the symptoms are also complicated, and the degree of softness is between both. But flesh is harder, and there is a swelling always, though the patient lies on his back; it does not yield to pressure, whereas the former easily does. If it be corrupted, it has the same appearances which I described in a cancer. A humour, if it be pressed, fluctuates. Air gives way to pressure, but quickly returns; and when the body is in a supine posture, the tumour retains the same figure.

Of these species, that which proceeds from air, does not admit of a cure. It is dangerous also to meddle with flesh that resembles a cancer; and therefore it must be let alone. Where it is sound, it ought to be cut out, and the wound dressed with lint. Some discharge the humour by making an incision in the top of the tumour, and cure that also by lint. With regard to the others, the opinions are various. However, the circumstances themselves make it plain, that the body must be laid in a supine posture; that whether it be the intestine or the omentum, it may fall back into the abdomen. Then the cavity of the navel being empty, by some is laid hold of by two regulae(20), and their ends being tied tight, the part mortifies: by others it is pierced to the bottom with a needle, followed by two threads, and is tied on the one side and the other by the two ends of each of these threads (as is done in the staphyloma of the eye) for by this means the part above the ligature mortifies. Others added this process to the operation: before tying, they made a single incision on the top, that, by introducing a finger, they might push back the protruded part, and then made the ligature. But it is sufficient to order the patient to hold in his breath, that the tumour may show itself in its full magnitude; then to mark the base of it with ink; and laying the person on his back, to press down the tumour, that if any part has not returned, it may be forced in by the hand; this done, to draw up the navel, and where the mark of the ink is, to tie it strongly with a thread; then to cauterize the part above the ligature, either with medicines, or the actual cautery, till it be mortified; and to dress the ulcer like other burns. This method is very successful not only when the intestine, or the omentum, or both are contained in it, but even where it is a tumour.

But some circumstances are to be considered, before proceeding to the operation, that no danger may arise from the ligature. For neither an infant, nor an adult, nor an old man are proper subjects for this method of cure; but generally such as are from seven to fourteen years old. Next, that person is in a fit condition for it, whose body is sound; but one, who is in a bad habit, and labours under papulæ, impetigoes, and the like disorders, is not a proper subject. Slight tumours also are easily removed; but there is danger in attempting to cure those that are too large. The autumnal and winter season of the year must be avoided. Spring is most suitable: and the beginning of summer is not amiss. Besides these precautions, it is necessary to fast the day before. Nor is that sufficient; for a clyster must also be given, that all the protruded parts may the more easily subside within the abdomen.