A sweat is procured in two ways; either by a dry heat, or a bath. A dry heat is raised by hot sand, the laconicum, and clibanum(28), and some natural sweating places, where a hot vapour exhaling out of the earth is inclosed by a building, as there is at Baiæ amongst the myrtle groves. Besides these, it is solicited by the sun and exercise. These kinds are useful, wherever an internal humour offends, and is to be dissipated. Also some diseases of the nerves are best cured by this method. And the others may be proper for weak people: the heat of the sun and exercise agree only with the more robust; when they are falling into a disorder, or even during the time of distempers not violent, provided they be free of a fever. But care must be taken, that none of these be attempted either in a fever(29), or in the time of crudity.

But the use of the bath is twofold. For sometimes after the removal of fevers, it is a proper introduction to a fuller diet and stronger wine for the recovery of health: sometimes it removes the fever itself. And it is generally used, when it is expedient to relax the surface of the skin, and solicit the evacuation of the corrupted humour, and to change the habit of the body. The ancients used it with greater caution: Asclepiades more boldly. And there is no reason to be afraid of it, if it be seasonable: before the proper time, it does harm. Whoever has been freed of a fever, as soon as he has escaped the fit for one day, on the day following, after the usual time of its coming on, may safely bathe. And if the fever used to be periodical, so as to return upon the third or fourth day, whenever it has missed, the bath is safe. And even during the continuance of fevers, if they be of the slow kind, and the patients have splenetic disorders of long standing, it is proper to make trial of this remedy: on this condition however, that the præcordia be not hard nor swelled, nor the tongue rough, and there be no pain either in the trunk of the body or in the head, and the fever be not then increasing. And in these fevers indeed, which have a certain period, there are two opportunities for bathing; the one, before the shuddering; the other, after the fit is ended. In those again, who are long distressed with slow febriculas, either when the fit is entirely off; or if that does not happen, at least when it has remitted, and the body is as sound, as it generally is in that kind of illness.

A valetudinary man, that is going into the bath, ought to be careful not to expose himself to any cold before. When he has come to the bagnio, he is to stand still a little, and try whether his temples are bound, and if any sweat breaks out: if the first has happened, and the other not followed, the bath will be improper that day: he must be anointed slightly, and carried back, and by all means avoid cold, and be abstemious. But if his temples are not affected, and a sweat begins, first there, and then elsewhere, he must wash his mouth with plenty of warm water, then go into the bath; and there he must observe, whether at the first touch of the warm water he feels a shuddering upon the surface of his skin; which can scarcely happen, if the circumstances above-mentioned were as they should be: however, this is a certain sign of the bath’s being hurtful.

One from the state of his health may know, before he go into the warm water, whether it be proper to anoint himself after it. However for the most part (except in cases where it shall be expressly ordered to be done after) upon the beginning of a sweat the body is to be anointed gently, and then to be dipped in the warm water. And in this case also regard must be had to his strength; and he must not be allowed to faint by the heat, but must be speedily removed, and carefully wrapped up in cloaths, lest any cold get to him; and there also he must sweat, before he take any food.

Warm fomentations are millet-seed, salt, sand: any of these heated, and put into a linen cloth: even linen alone, if there be less heat required; but if greater, extinguished coals, wrapt up in cloths, and applied round a person. Moreover bottles(30) are filled with hot oil: and water is poured into earthen vessels, which from their resemblance in shape are called lenticulæ(31): and salt is put into a linen bag, and dipt into water well heated, then set upon the limb that is to be fomented. And at the fire are placed two ignited pieces of iron, with pretty broad heads: one of these is put into dry salt, and water is sprinkled lightly upon it; when it begins to grow cold, it is carried back to the fire: the other is made use of in the same manner; so each of them alternately: and in the mean time, the hot and salt liquor drops down through the cloth, which relieves the nerves contracted by any disease. All of them have this property in common of dissipating that, which either loads the præcordia, or suffocates the fauces, or is hurtful in any limb. When each of these sorts of fomentations is to be used, shall be directed under the particular kinds of distempers.