Of the living things among the beasts that are upon the earth (vv. 2-8), those are permitted for food which both chew the cud and divide the hoof; every animal in which either of these marks is wanting is forbidden. Of the things which live in the waters, those only are allowed for food which have both fins and scales; those which lack either of these marks, such as, for example, eels, oysters, and all the mollusca and crustacea, are forbidden (vv. 9-12). Of flying things (vv. 13-19) which may be eaten, no special mark is given; though it is to be noted that nearly all of those which are by name forbidden are birds of prey, or birds reputed to be unclean in their habits. All insects, "winged creeping things that go upon all four" (ver. 20), or "whatsoever hath many feet," or "goeth upon the belly," as worms, snakes, etc., are prohibited (ver. 42). Of insects, a single class, described as those "which have legs above their feet, to leap withal upon the earth," is excepted (vv. 21, 22): these are known to us as the order _Saltatoria_, including, as typical examples, the cricket, the grasshopper, and the migratory locust; all of which, it may be noted, are clean feeders, living upon vegetable products only. It is worthy of notice that the law of the clean and the unclean in food is not extended, as it was in Egypt, to the vegetable kingdom. The second section of the chapter (vv. 24-40) comprises a number of laws relating chiefly to defilement by contact with the dead bodies of animals. In these regulations, it is to be observed that the dead body, even of a clean animal, except when killed in accordance with the law, so that its blood is all drained out (xvii. 10-16), is regarded as defiling him who touches it; while, on the other hand, even an unclean animal is not held capable of imparting defilement by mere contact, so long as it is living. Very minute charges are given (vv. 29-38) concerning eight species of unclean animals, of which six (vv. 29, 30, R.V.) appear to be different varieties of the lizard family. Regarding these, it is ordered that not only shall the person be held unclean who touches the dead body of one of them (ver. 31), but also anything becomes unclean on which such a dead body may fall, whether household utensil, or food, or drink (vv. 32-35). The exception only is made (vv. 36-38), that fountains, or wells of water, or dry seed for sowing, shall not be held to be by such defiled. That which has been made unclean must be put into water, and be unclean until the even (ver. 32); with the exception that nothing which is made of earthenware, whether a vessel, or an oven, or a range, could be thus cleansed; for the obvious reason that the water could not adequately reach the interior of its porous material. It must therefore be broken in pieces (vv. 33, 34). If a person be defiled by any of these, he remained unclean until the even (ver. 31). No washing is prescribed, but, from analogy, is probably to be taken for granted.