Nature Back throws little light upon conditions necessary for modern labor. It can do nothing but demand the abolition of the factory, the big store, the tenement, the school. Nature Fore says we cannot abolish the means of working out the highest forms of cooeperation. But we can make them compatible with natural living. We can modify conditions so that earning a livelihood will not compel workers to violate natural law at any or all times. The greatest need of factory and tenement reform is for parents and teachers to make a religion of Nature Fore and to instill its principles in the minds of children. Parents and teachers must live the natural before they can make children love the natural. Parents and teachers cannot possibly be natural in this day, cannot live or love natural law unless they know the machinery by which their communities are combating conditions prejudicial to health, morals, and civic efficiency. INDEX Adenoids. See _Mouth breathing_ Administration, health: steps in evolution, 11-22; knowledge of needs, 220; machinery, 302-309; in combating alcoholism, 362; departments of health: (1) New York City, 26, 27, 47, 48, 61, 71, 84, 296-298, 302; (2) general, 265, 281 Advertisements: motives for, 8; for dental parlors, 100; for consumptives, 234; by physicians, 281; educational, in newspapers and magazines, 323; "no smoking" signs, 365; of patent medicines, 369; that promote health, 378-383 Agassiz, Louis, 398, 400 Air, night, 216. See _Fresh air_ Alcoholism, 343-362; compulsory instruction in, 3; insurance companies against, 7; disqualifies for railroad service, 193; depletes vitality, 201; results, 209; Hartley's fight against, 253; injures the tuberculous, 274; ineffective ways of combating, 343; incited by bad living conditions, 348; injury to negroes, 350; so-called moderate use, 358; labor unions blacklist drunkards, 361; social dangers, 386; mental hygiene, 392, 396 Animal sanitation, 252, 260, 307 Association for Improving the Condition of the Poor, New York, 177, 236, 253 Babies. See _Milk_ Bathing: motives for, 8, 13; a social requirement, 14; cold-water, 214 Beauty, reason for health, 15