Pyridin in tobacco smoke, 260-261. Quack remedies, to be avoided in case of colds, 280. Quacks and quack advertising, movement against, 162-163. Quarantine, included in public hygiene, 158. Quensel, Ulrik, on disagreement of work and alcohol, 244. Quick lunches, an institution of civilization, 150; relative energy values and cost of different orders at, 184-190. Quinine, use of, deleterious in case of colds, 280. Race hygiene. _See_ Eugenics. Races, effects of indoor living on different, 146-147; varied conditions in different, with respect to resistance to disease, 323. Raw foods, value of, 42. Reading, choice of, for recreation, 99. Reading on trains, eye-strain caused by, 93. Ready-to-serve foods, analysis and cost of, 184-190. Recreation, outdoor, 19; necessity for, 89, 98; importance of enjoyment of, 98-99; forms of, 99; advantages possessed by games, 99; reading, dancing and card-playing, 99-100; suicidal amusements, 100. Régime, demand for a well-balanced, 125-126. Relatives, marriage of, 305-306. Relaxation, cultivation of power of, 101; bathing a help to, 102. Religion, as a help in field of mental hygiene, 114; of healthy-mindedness, 114-115. Reproduction, rules of, under a eugenic program, 167. Rest and sleep, the two great forms of inactivity, 89. Rheumatism, traceable to focal infection, 82. Rice, not a laxative food, 52; food value of, 180. Richards, Mrs., on cost of food, 130. Roosevelt Conservation Commission on National Vitality, report of, 136. Rosenau, Dr., on sex instruction, 77. Rowing-machine, home exercise on, 94. Rubner, Prof., on injuries from overabundance of protein, 38-39. Running, a beneficial exercise, 94. Saccharin, harmful in foods, 65. Salt, to be used sparingly, 48. Salts, inorganic, in mixed diet, 43. Sandals, benefits and risks in wearing, 17. School, teaching correct posture in, 63. Schools, outdoor, 19. Segregation of defective classes, 321-322, 323. Self-respect, relation between erect posture and, 63-64. Serenity, to be practised as an art, 113. Setting-up exercises, 221-224. Sex hygiene, eugenics not limited to, 293-294. Sex instruction, 77-78. Shaler, N. S., "Man and the Earth," quoted, 143-144. Shell-fish, a high-protein food, 38; special objections to too great an amount of, 39. Shoes, care necessary in choosing proper, 16-17. Shredded wheat biscuit, food value of, 29, 181. Signal-station exercise, for faulty posture, 222. Singing, as a hygienic practise, 26. Sitting, correct posture in, 60-62. Skim milk, a cheap source of protein, 131. Skin training, establishing resistance to colds by, 273-274; means of, 274-275; by wearing light, porous clothing, 275.