The researches of the scholar working in combination with the engineer have unearthed — more particularly in Mesopotamia, in Egypt and in Greece — evidences of an ancient medical science far advanced beyond that briefly described in the preceding chapter. These evidences relate to nations that flourished as far back as four thousand years B. C. While they are very fragmentary and cover historical events which are often separated from one another by long periods of time, these data nevertheless suffice to give one a fairly good idea of the then prevailing state of medical knowledge...