108. The Arabians say also that all the world would have been by this time filled with these serpents, if that did not happen with regard to them which I knew happened with regard to vipers: and it seems that the Divine Providence, as indeed was to be expected, seeing that it is wise, has made all those animals prolific which are of cowardly spirit and good for food, in order that they may not be all eaten up and their race fail, whereas it has made those which are bold and noxious to have small progeny. For example, because the hare is hunted by every beast and bird as well as by man, therefore it is so very prolific as it is: and this is the only one of all beasts which becomes pregnant again before the former young are born, and has in its womb some of its young covered with fur and others bare; and while one is just being shaped in the matrix, another is being conceived. Thus it is in this case; whereas the lioness, which is the strongest and most courageous of creatures, produces one cub once only in her life; for when she produces young she casts out her womb together with her young; and the cause of it is this:—when the cub being within the mother 98 begins to move about, then having claws by far sharper than those of any other beast he tears the womb, and as he grows larger he proceeds much further in his scratching: at last the time of birth approaches and there is now nothing at all left of it in a sound condition. 109. Just so also, if vipers and the winged serpents of the Arabians were produced in the ordinary course of their nature, man would not be able to live upon the earth; but as it is, when they couple with one another and the male is in the act of generation, as he lets go from him the seed, the female seizes hold of his neck, and fastening on to it does not relax her hold till she has eaten it through. The male then dies in the manner which I have said, but the female pays the penalty of retribution for the male in this manner:—the young while they are still in the womb take vengeance for their father by eating through their mother, 99 and having eaten through her belly they thus make their way out for themselves. Other serpents however, which are not hurtful to man, produce eggs and hatch from them a very large number of offspring. Now vipers are distributed over all the earth; but the others, which are winged, are found in great numbers together in Arabia and in no other land: therefore it is that they appear to be numerous. 110. This frankincense then is obtained thus by the Arabians; and cassia is obtained as follows:—they bind up in cows'-hide and other kinds of skins all their body and their face except only the eyes, and then go to get the cassia. This grows in a pool not very deep, and round the pool and in it lodge, it seems, winged beasts nearly resembling bats, and they squeak horribly and are courageous in fight. These they must keep off from their eyes, and so cut the cassia.