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Classification of the Sci
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that tempts us here would be too seductive from the problem we have in hand. Let us proceed at once to enumerate those scientific inquiries whose purposes are to discover the best way of satisfying the different single instincts.

An immense body of lore is directly related to the health instinct. The term Medicine may well be extended to cover the whole, dividing into Hygiene and Iatrics. Under hygiene the special subjects of Military Hygiene and Public Hygiene are inquiries which make the business of different men's lives. The latter, which involves the disposal of garbage, drainage, and sewerage, might be extended so as to include everything relating to the sanitation of dwellings, such as ventilation. Under personal hygiene, special life-studies are those of gymnastics, balneology, massage, diet, to which hypnology might be added. In most of the states of our Union, the deleterious effect of alcohol is made a special study by law. Iatrics is commonly divided, according to the method of treatment into