H Hard water, 110 Heat, 80 Heat exhaustion, 68 Heat loss, 58 Heat, molecular theory of, 79 Heat stroke, 59 Heating, 79 Central, 88 Combustion, 79 Conduction, 86 Convection, 88 Fireplace, 84 Hot air, 88 Hot water, 89 Local, 84, 85 Methods of, 83 Normal heat, 80 Of schoolroom, 144 Proper temperature, 82, 83 Radiators, 89 Radiation, 84 Steam, 91 Stove, 86 System, requirements of, 83 Three methods of, 83 Head, 292 Health, meat danger to, 270 Hearing, 290 Height of child, 289 Table showing average, 287 Helium, 44, 46 Hemoglobin, 46, 48 Hepatization, 340 Gray, 346 Red, 346 Highly acid urine, 386 History of public water supply, 106 Host, 175 Hot air, 88 Hot box, 314, 347 Hot water, 89 House dampness, 34 House plumbing, 37 House sewer, 39 Humidity, 55, 58, 61, 62 Absolute, 56 Relative, 56 Hunger, 232 Hunger cry, 313 Hydatid, 271 Hydrogen, 44 Hydrogen peroxide, 44, 49 Hydrocephalus, 382 Hygeia, 13 Hygiene, 19, 301 Chiropractic, 19 Defined, 13 Housing, 28 Layman’s, 19 Medical, 19 Personal, 13 Public, 14 Sanitation, aim and function of, 15 Three viewpoints on, 19 Hygienic measures, 329 In so-called communicable dis-eases, 224 Hyperacidity of urine, 386 Hypertrophic stenosis, 357 Hysteria, 385 I Ice coils, 73 Ice, manufactured, 127 Icterus, 369 Equation, 370 Family, 370 Major adjustment, 370 Pathological, 369 Physiological, 369 Symptoms, 369 Ignition proof, 36 Ill effects of damp houses, 35 Immunity, 181, 191, 192 Acquired, 183 Adaptability of body in, 186 Artificial, 183 Defined, 181 Exhaustion theory, 184, 189 Mechanism of, 188 Natural, 182 Retention theory, 184 Various theories of, 185 Impounding reservoirs, 116 Impervious strata, 119 Impurities in air, 30, 67 Inanition, 235, 236 Major adjustments, 374 Symptoms, 374 Incandescent electric light, 100 Incessant crying, 314 Incineration of refuse, 134 Incoördinations of bladder, 386 Of infants, zones involved, 312 Of larynx, 332 Of lungs, 340 Increased air pressure, 51 Increased rate of breathing, 50 Incubation, stage of, 172 Indigestion, 357 Acute intestinal, 359 Chronic intestinal, 361 Indirect infection, 199, 200 Method of lighting, 102 Radiation, 87 Industrial dusts, 164 Industrial establishments, 161 Industrial hygiene, 156 Definition, 156 Dust, classification of, 164, 165 Place of work, 159 Poisons, 158, 165, 166, 167, 168 Work places, 162 Infant, thorax of, 340 Infantile atrophy, 375 Infants, adjusting, 321 Infection, 23, 172, 199, 200