Walls, 33 In school room, 142 Methods of construction, 33 Walking, 295 Warm dry air, 61 Warm moist air, 59 Washing the air, 73 Water, 105, 106, 108 Amount needed per day, 111 Artificial reservoirs, 116 Chemical purification of, 131 Chemically pure, 108, 109 Cisterns, 113 Composition of, 107 Condensation, 126 Distillation of, 109 Distilled, 129 Elimination from body, 111 Evaporation, 126 Fall mixing of, 117 Filtration, 129 Foreign ingredients in, 108 General considerations, 106 Ground, 113, 120 Hard, 110 Impounding reservoir, 116 Lakes, 115 Muddy, 110 Necessity for, in body, 109 Needed for all purposes, 111 Palatability of, 108 Proper supply of, 106 Purification of, 126 Rain, 113 Sedimentation, 128 Self-purification of, 126 Snow, 113 Soft, 110 Sources of impurities, 118 Spring, 118 Stagnation of, 116 States of aggregation, 108 Streams, 115 Subsoil, 113, 118, 121 Surface, 113, 114, 117 Taste of, 110 Turbid, 110 Underground, 120 Universal solvent, 109 Well, 118 Water curtain, 75 Water-logged, 33-36 Water meters, 113 Waterproof course in walls, 35 Water-soluble B, 240, 256 Water-soluble C, 240, 256 Water supply, 112, 113, 146 Water vapor, 55 Water waste, 113 Weight, gain in, 286 Weight, how considered, 286 Weight, loss of, 287 Weight of boys at birth, 285 Weight of girls at birth, 285 Weight, table showing average, 287 Wells, 123 Wet clothing, 146 Window area, 98, 99 Window hopper, 70 Window shades, 99, 143 Window ventilation, 69 Wood shingles, 34 Work, place of, 159 Work places, 162 Writer’s cramps, 161 X Xenon, 44, 46 Z Zinc, 166 Transcriber’s Notes pg 53 Changed: These may form in the labryinth of the ear to: These may form in the labyrinth of the ear pg 101 Changed: which will permit some of the light days to penetrate to: which will permit some of the light rays to penetrate pg 132 Changed: running sores, conjunctivitis, or veneral diseases to: running sores, conjunctivitis, or venereal diseases pg 171 Changed: while enviromental dis-eases are attributed to: while environmental dis-eases are attributed pg 187 Changed: so as to increase the processs of adaptation to: so as to increase the process of adaptation pg 234 Changed: There is an engorgment of the liver to: There is an engorgement of the liver pg 249 Changed: 4—Fradulent labeling of food to: 4—Fraudulent labeling of food pg 323 Changed: extreme case must be exercised to: extreme care must be exercised pg 342 Changed: may tend to influence and exxagerate to: may tend to influence and exaggerate