There is, again, a third[105] kind of tortoise, which inhabits mud and swampy localities: the shell on its back is flat and broad, like that upon the breast, and the callipash is not arched and rounded, the creature being altogether of a repulsive appearance. However, there are some remedial medicaments to be derived even from this animal. Thus, for instance, three of them are thrown into a fire made with wood cuttings, and the moment their shells begin to separate they are taken off: the flesh is then removed, and boiled with a little salt, in one congius of water. When the water has boiled down to one third, the broth is used, being taken by persons apprehensive of paralysis or of diseases of the joints. The gall, too, is found very useful for carrying off pituitous humours and corrupt blood: taken in cold water, it has an astringent effect upon the bowels. There is a fourth kind of tortoise, which frequents rivers. When used for its remedial properties, the shell of the animal is removed, and the fat separated from the flesh and beaten up with the plant aizoüm,[106] in combination with unguent and lily seed: a preparation highly effectual, it is said, for the cure of quartan fevers, the patient being rubbed with it all over, the head excepted, just before the paroxysms come on, and then well wrapped up and made to drink hot water. It is stated also, that to obtain as much fat as possible, the tortoise should be taken on the fifteenth day of the moon, the patient being anointed on the sixteenth. The blood of this tortoise, dropt, by way of embrocation, upon the region of the brain, allays head-ache; it is curative also of scrofulous sores. Some persons recommend that the tortoise should be laid[107] upon its back and its head cut off with a copper knife, the blood being received in a new earthen vessel; and they assure us that the blood of any kind of tortoise, when thus obtained, will be an excellent liniment for the cure of erysipelas, running ulcers upon the head, and warts. Upon the same authority, too, we are assured that the dung of any kind of tortoise is good for the removal of inflammatory tumours. Incredible also as the statement is, we find it asserted by some, that ships[108] make way more slowly when they have the right foot of a tortoise on board. CHAP. 15.—REMEDIES DERIVED FROM THE AQUATIC ANIMALS, CLASSIFIED ACCORDING TO THE RESPECTIVE DISEASES.