Heart’s need of exercise, 310 Heat, animal, 26 dissipation of, 26 physiologic effects of, 27 production of, 26, 27, 303, 308 Height, weight, and chest measurements, relative proportion of, 148, 297 Hemorrhoids, 102 Hereditary predispositions, 225 Heredity, influence of, on health, 224-226 Hockey, 372 Hormones, 89 Horseback riding, 328 Hot-water bottle, action of, 29 Houses, degree of moisture of air of, 155 disinfection of, after tuberculosis, 174, 175 effects of gloomy, 238 temperature of, 155 ventilation of, 151-155 Hydrotherapy defined, 23 value of, 23. See _Baths_ and _Douches_. Hygiene of mind, 224-251 Hygrometer, 156 Idleness as cause of nervous prostration, 223, 247 Thomas on ill effects of, 248, 249 Industrial training of women, necessity for, 247 Infectious diseases, 169-175 bronchitis, 159, 160, 168, 169 causes of, 149-151, 153, 169 common colds, 159, 169-171 influenza, 159, 169, 170 pharyngitis, 151, 159, 160 Influenza, 169 cause of, 150, 159 relation of, to pneumonia, 171 to tuberculosis, 169, 173 Ingrowing toe-nails, causes of, 78 treatment of, 78 Inhibition, 240-242 importance of, 242 training in, 241 Insomnia, 196 causes of, 194, 196, 220 injurious effects of, 203, 219 treatment of, 39, 204 Intestinal bacteria, 97 Invertase, 94 Iron, 102 Irrigations, vaginal, 54-56 Katabolism, 99 Kidneys, description of, 175 diseases of, treatment of, 52 function of, 175-179 Kidneys, function of, relation of, to skin and lungs, 176 Knee-chest position, description of, 53 Lactase, 94 Lamp shades, 211, 212 Larynx, 143 Laughter, physiologic necessity for, 200, 201 Life, prolongation of, 132, 313 Lighting, artificial, 211, 212 natural, 212 Lipase, 94 Literature, 239, 240 molding influence on the mind, 239 taste for, formed in youth, 240 Lungs, 143 description of, 143 frequency of diseases of, 137 good development of, 137, 311 exercises for, 165-168, 345, 349, 353 hygiene of, clothes in relation to, 164 relation of, to good health, 146 secretion of, 145 ventilation of, 165-168 vital capacity of, 148 weakness of, causes of, 137 Maltase, 94 Massage defined, 304 benefits of, 304-306 mode of procedure, 307 movements of, 306 friction, 306 grasping and pinching, 306 striking, 307 stroking, 307 vibration, 307 rise of temperature after, 308 time for giving, 307 Mastication, 82, 88 Meats, digestibility of, 110 nutritive properties, 110 Medical examination blank, 330