The snake itself and the snake-like reptiles are taboo, as well as numerous birds--all of which were at a very early period totem animals. Heading the list of the animals that may be eaten, on the other hand, are the ox, the sheep, the goat--in short, the animals of an agricultural and sheep-raising culture. Thus, as the original magical motives of taboo disappear, their place is taken by the emotion of fear, which causes the object arousing it to appear as unclean. Whoever touches such an object is polluted in a physical as well as a moral sense, and requires a cleansing purification according to rites prescribed by cult. We cannot avoid the impression, accordingly, that the unclean animals held to be taboo by the Priests' Code, are the same as those which this same people regarded as sacred soul and totem animals at an earlier stage of culture. Thus, these prohibitions with reference to food are analogous to the impassioned preaching against false idolatry--both refer back to an earlier cult. In this category belongs also the prohibition of consuming the blood of animals in the eating of their flesh. This likewise is the survival of a very common belief--certainly prevalent also among the Israelites at one time--that with the blood of an animal one might appropriate its spirit-power. The priestly law transforms this motive into its direct opposite. For the text expressly says: "In the blood is the life; but ye shall not destroy the life together with the flesh." Thus, the significance of the taboo shifts from the sacred, which evokes man's fear, to the unclean and demoniacal, which also arouse fear but in the form of aversion. Closely related to this change is a group of views and customs resulting from this last form of taboo and reaching down, as its after-effects, far into the later religious development. These are the _purification rites_ connected with the ideas of clean and unclean. The word _lustratio_, by which the Romans designated these rites, is really more appropriate than the German word _Reinigung_, since it suggests more than merely the _one_ aspect of these usages. Indeed, the idea of purification is not even primary, any more than the conception of the unclean is the initial stage in the development of the taboo. On the other hand, the idea that a man might be exposed to demoniacal powers by touching an object or by eating a certain food, such, for example, as the flesh of certain animals, is in entire accord with such primitive notions as are expressed in the fear of the corpse and of sickness, as well as in other similar phenomena. The essential thing is to escape the demon who is harboured in the particular object of concern. This impulse is so irresistible that, whenever the idea of taboo arises, the conception of lustration, of a magic counteraction to the demoniacal power, is also evolved. Thus, magic and counter-magic, here, as everywhere, stand in antithesis. The