15. Dry weather is injurious to other testacea, for it renders them fewer in quantity and inferior in quality, and the pectens become more red. In the Pyrrhæan Euripus the pectens perish, not only from the instrument with which the fishermen scrape them together, but also from dry weather. The other testacea thrive in wet weather, because it makes the sea-water fresher. The cold of the Pontus and of the rivers that flow into it renders bivalve shells rare. The univalves, however, are frozen in cold weather. This is the nature of aquatic animals.
Chapter XXI.
1. Among quadrupeds, swine suffer from three diseases, one of these is called sore throat, in which the parts above the jaws and the branchia become inflamed; it may also occur in other parts of the body, and frequently seizes upon the foot, and sometimes the ear. The neighbouring parts then become putrid, until it reaches the lungs, when the animal dies; the disease spreads rapidly, and the animal eats nothing from the period of the commencement of the disease, be it where it will. The swineherds have no other remedy but the excision of the part before the disease has spread far.
2. There are two other diseases which are both called craura. One of them consists in a pain and weight in the head, with which many of them are afflicted; the other is an excessive alvine discharge. This appears to be incurable. They relieve the former by the application of wine to the nostrils, and washing them with wine. Recovery from this disease is difficult, for it generally carries them off on the third or fourth day.
3. They suffer particularly from sore throat, when the summer bears abundantly, and they are fat. The fruit of the mulberry is good for them, and abundant washings with warm water, and scarification beneath the tongue. If the flesh of swine is soft, it is full of small lumps (chalazæ) about the legs, neck, and shoulders; for in these parts the chalazæ are most frequent. If there are but a few, the flesh is sweet; if many, it becomes very fluid and soft.
4. Those which have these chalazæ are easily distinguished; for they exist in the greatest numbers under the tongue, and if the hair is plucked from their mane it appears bloody underneath. Those which have chalazæ cannot keep their hind legs still. They are not thus affected as long as they suck. The grain called tipha, which also forms excellent food, is the remedy for the chalazæ. Vetches and figs are useful both for fattening and rearing pigs; and on the whole their food should not be all of one sort, but varied; for swine, like other animals, derive advantage from a change in their food; and they say that at the same time their food ought to inflate them, and to cover them both with flesh and fat. Acorns are good for their food, but make their flesh watery; and if they eat too many while pregnant, they produce abortions, as sheep also do; for these animals evidently suffer this from eating acorns. The swine is the only creature that we know of which has chalazæ in its flesh.
Chapter XXII.
1. Dogs suffer from these diseases which have received these names, lytta, cynanche, podagra. The lytta produces madness, and they infect every creature which they bite, except mankind, with the same disease. This disease is fatal to dogs and to any other animal they may bite except man. The cynanche also is fatal to dogs; and there are comparatively few which recover from the podagra. Camels also are seized with lytta. (The elephant does not appear to suffer from any other infirmity except flatulency.)
2. Gregarious oxen suffer from two diseases, one called podagra, the other craurus. The podagra affects their feet; but it is not fatal, nor do they lose their hoofs. They derive benefit from their horns being smeared with warm pitch. When attacked with craurus, their breathing becomes warm and thick. Fever in mankind is the same as craurus in cattle. It is a sign of this disease, when they hang down their ears and will not eat. It soon proves fatal, and when dissected, their lungs appear putrid.