The answer may be found by reference to the late Professor de Chaumont's now classical outline of the stages to be identified in the hygienic education of a race. He divided these into three periods, of which he described the first as merely "Instinctive," for efforts after sanitary practice were dictated solely by the personal discomfort associated with their neglect. In those far-off prehistoric days, Professor Boyd Dawkins tells us that primitive man, then in his nomadic stage, would dig runnels to carry off the rain water from the near neighbourhood of his shelters, or would move on to fresh pastures when his family and herds had fouled the nearest stream, or change his camping ground when the accumulated refuse of his food and his prowess as a hunter interfered with convenient access to his dwelling; but he took no precautions to prevent the recurrence of these discomforts, and his efforts to remove their consequences were purely temporary. To this there succeeded what Professor de Chaumont designated the "Supernatural" period,[96] which extended over many thousands of years, during the dawn of which Eastern rulers often combined in their own person the triple callings of priest, prophet, and physician. Whether it be in China or in Persia, in Egypt or in India, among the Greeks, the Arabs, or the Hebrews, the practice of physical morality and of personal cleanliness, of restrictions of diet or protection from infection, were closely woven into the religion of the people. Reasons of health and sanitary advantages permeate the rules of more faiths than that of the Jews--whose Lawgiver embodied in the Pentateuch health maxims now known to have been derived from earlier civilisations.