XIX. WHY DOES THE POLYPUS CHANGE COLOR? WHETHER, as Theophrastus writes, because it is an animal by nature timorous; and therefore, being disturbed, it changes color with its spirit, as some men do, of whom it is said, an ill man ever changes color? But though this may serve as a reason for changing its color, it will not for the imitation of colors. For the polypus does so change its color, that it is of the color of every stone it comes nigh. Hence that of Pindar, Mind the color of the marine beast, and so converse cunningly in all cities; and that of Theognis: Put on a mind like th’ polyp fish,— And learn so to dissemble,— Which of the rock whereto it sticks The color doth resemble. Theognis , vs. 215. And they say, that such as are excellent at craftiness and juggling have this in their eye,—that they may the better cheat them they have to deal withal,—ever to imitate the polypus. Some think the polypus can use her skin as a garment, and can put it on or off at pleasure. But if fear occasions this change in the polypus, is not something else more properly the cause? Let us consider what Empedocles says, that effluvia proceed from all things whatever. For not only animals, plants, the earth and sea, but stones, and even brass and iron, do continually send out many effluvia. For all things corrupt and smell, because there runneth always something from them, and they wear continually; insomuch that it is thought that by these effluvia come all attractions and insultations, some supposing embraces, others blows, some impulses, others circuitions. But especially about the sea rocks, when they are wet and cool by the waves (as is most likely), constantly some small particles are washed off, which do not incorporate with other bodies, but either pass by the smaller passages, or pass through the larger. Now the flesh of the polypus, as one may judge by the eye, is hollow, full of pores, and capable of effluvia. When therefore she is afraid, as her spirit changes she changes herself, and by straitening and contracting her body, she encloses the neighboring effluvia. And, as a good token of this argument, the polypus cannot imitate the color of every thing he comes near, nor the chameleon of any thing that is white; but each of these creatures is assimilated only to those things to whose effluvia it has pores proportionable. XX. WHAT IS THE REASON, THAT THE TEARS OF WILD BOARS ARE SWEET, AND THE TEARS OF THE HART SALT AND HURTFUL? THE reason seems to be the heat and cold of these animals. For the hart is cold, and the boar is very hot and fiery; therefore the one flies from, the other defends himself against, his pursuers. Now when great store of heat comes to the eyes (as Homer says, with horrid bristles, and eyes darting fire), tears are sweet. Some are of Empedocles’s opinion, who thought that tears proceed from the disturbance of the blood, as whey does from the churning of milk; since therefore boar’s blood is harsh and black, and hart’s blood thin and watery, it is consentaneous that the tears, which the one sheds when excited to anger, and the other when dejected with fear, should be of the same nature. XXI. WHY DO TAME SOWS FARROW OFTEN, SOME AT, ONE TIME AND OTHERS AT ANOTHER; AND THE WILD BUT ONCE A YEAR, AND ALL OF THEM ABOUT THE SAME TIME AT THE BEGINNING OF SUMMER, WHENCE IT IS SAID,— The wild sow farrowing, that night falls no rain? Is it because of plentiful feeding, as in very truth fulness doth produce wantonness? For abundance of nourishment breeds abundance of seed both in animals and plants. Now wild sows live by their own toil, and that with fear; the tame have always food enough, either by nature or given them. Or may it not be ascribed to their rest and exercise? For the tame do rest and go not far from their keepers; the wild get to the mountains, and run about, by which means they waste the nutriment, and consume it upon the whole body. Therefore either through continual converse, or abundance of seed, or because the females feed in herds with the males, the tame sows call to mind coition and stir up lust, as Empedocles talks of men. But in wild sows, which feed apart, desire is cold and dull for want of love and conversation. Or is it true, what Aristotle says, that Homer called the wild boar χλούνης , because he had but one stone? For most boars spoil their stones (he says) by rubbing them against stumps of trees.