Jevons has shown[625] that in "sympathetic magic,"--of which the interpretation of omens is an offshoot,--the same logical methods are followed as in modern science. The famous 'Chaldean wisdom,' which is to be looked for in this widespread omen literature, would not have created so deep an impression on the ancient world, if the theologians of the Euphrates Valley, in incorporating primitive magic in the official religion, had not been successful in giving to their interpretations of occurrences in nature and in the animal world, the appearance, at least, of a consistent science. Taking up as our first illustration the series devoted to birth portents, it is interesting to observe the system followed in presenting the various phases of the general subject. A broad distinction is drawn between significant phenomena in the case of human infants and in the case of the young of animals. About a dozen tablets are taken up with an enumeration of omens connected with new-born children, and one gains the impression from the vast number of portents included in the lists that originally every birth portended something. The fact that births were of daily occurrence did not remove the sense of mystery aroused by this sudden appearance of a new life. Every part of the body was embraced in the omens: the ears, eyes, mouth, nose, lips, arms, hands, feet, fingers, toes, breast, generatory organs. Attention was directed to the shapes of these various members and organs. The ears of a child might suggest the ears of a dog or of a lion or of a swine, and similarly the nose, mouth, lips, hands, or feet might present a peculiar appearance. A single member or the features in general might be small or abnormally large. All these peculiarities meant something; and since few if any children are born without presenting some peculiarities in some part of the body, it would seem as though the intention of the compilers of the series was to provide a complete handbook for the interpretation of signs connected with the birth of children. Naturally the total absence of some member of the body in case of the new-born or any malformation was a sign of especial significance. Hence we are told what was portended by a child born without hands or feet or ears or lips, or with only one of these members, or with only one eye, or with no mouth or no tongue, or with six fingers on one or on both hands, or six toes on one or on both feet, or without generatory organs.[626] The rarer the phenomenon, the greater the significance is, as we have seen, a general principle in the science of augury. The birth of twins accordingly plays an important role in the series. In fact, the opening tablet is devoted in part to this phase of the subject. We are told, for example, that[627] If a woman gives birth to twins, one male and one female, it is an unfavorable omen. The land is in favor[628], but that house (wherein the child was born) will be reduced. And again,