lot.’ Respected equally throughout the ages by Arab, Jew, and Christian, the oath remains the watchword of the profession of medicine.[111] The ethical value of such a declaration could not escape the attention even of a Byzantine formalist, and it is interesting to observe that in our oldest Greek manuscript of the Hippocratic text, dating from the tenth century, this magnificent passage is headed by the words ‘from the oath of Hippocrates according as it may be sworn by a Christian.’[112] [111] It must, however, be admitted that even in the Hippocratic collection itself are cases of breach of the oath. Such, for instance, is the induction of abortion related in περὶ φύσιος παιδίον, _On the nature of the embryo_. There is evidence, however, that the author of this work was not a medical practitioner. [112] Rome Urbinas 64, fo. 116. When we examine the Hippocratic corpus more closely, we discern that not only are the treatises by many hands, but there is not even a uniform opinion and doctrine running through them. This is well brought out by some of the more famous of the phrases of this remarkable collection. Thus a well-known passage from the _Airs, Waters, and Places_ tells us that the Scythians attribute a certain physical disability to a god, ‘but it appears to me’, says the author, ‘that these affections are just as much divine as are all others and that no disease is either more divine or more human than another, but that all are equally divine, for each of them has its own nature, and none of them arise without a natural cause.’ But, on the other hand, the author of the great work on _Prognostics_ advises us that when the physician is called in he must seek to ascertain the nature of the affections that he is treating, and especially ‘if there be anything divine in the disease, and to learn a foreknowledge of this also.’[113] We may note too that this sentence almost immediately precedes what is perhaps the most famous of all the Hippocratic sentences, the description of what has since been termed the _Hippocratic facies_. This wonderful description of the signs of death may be given as an illustration of the habitual attitude of the Hippocratic school towards prognosis and of the very careful way in which they noted details: [113] Kühlewein, i. 79, regards this as an interpolated passage.