Induction, charging by, vi, 290-2, 297-301; discovery, 22, 23; electrification by, iv, 260; electrodynamic and static, vii, 370; law of, vi, 313; Lenz's Law, vii, 371; magnetization by, iv, 243; self, vii, 375; unit of, iv, 285 Induction, Proof by, xi, 242 Induction Coils, iv, 265, 303-5, vii, 364, 370; in automobiles, 133-4; in electrotherapy, 242-4, 245; in wireless telegraphy, iv, 313, 314 Induction Machines, vi, 292, 298-301, vii, 245 Induction Motors, vi, 241, 242-56; in motor-generator sets, 332, 342 Induction Regulators, vi, 328-9, 346 Inductivity, vi, 293-4 Industrial Plants, advantages of electricity, vii, 51-3; lighting, 52; wiring, 57 Industrial Psychology, xi, 358-67 Industry, electricity in, vi, 195-6, 381; energy sources, viii, 267-8; metals of, 154; motors most used, vi, 241; science in, xvi, 9-10; water power and, vi, 352 Inertia, defined, vi, 90-1, vii, 370; examples of, iv, 35, 62, 66, 67, v, 148, 234, 336-9; in electrical currents (see Inductance); in perception errors, xi, 184, 189; law of, ii, 62, iv, 19-20, 61-2; of æther, vi, 120; of ear, xi, 105; of sense organs, 71 Infancy, period of, x, 283, xvi, 79 Infantile Paralysis, germ of, x, 200, 202; immunity to, 207 Infants, ape-like structures in, xv, 61; bodily condition and care of, ix, 345-52; clothing of, x, 309; grasping reflex, xi, 40-3; heart rate in, x, 334; learning to breathe, xi, 36-7; learning to fixate, 39-40; learning to swallow, 38; milk modifications, viii, 363; nervous system in, ix, 344, 348-9; new-born, free from germs, x, 201; new-born, weight of, ix, 31; periodic breathing in, x, 340; skull capacity in, xv, 40; space perceptions, xi, 162-3, 166 Infections, ix, 177-8, x, 193; by germs, x, 193, 204; body resistance to, 197-8, 203-12; body resistance to, ix, 177-9, 185-6; exhaustion from, ix, 59-60; focal, x, 198-9, 218-26; in surgery, prevention of, 14, 123, 145-7, 181-3; local and general, 198; "portals" of, 198, 201-2; pus, ix, 186-8 Infectious Diseases, x, 193-226; atmospheric electricity and, i, 330; danger from, 326; heredity and, x, 234-5; immunity to, 204-12, ix, 179; infants' susceptibility to, ix, 352; pain in, 87; Pasteur and Koch's work, xvi, 184; prevention and treatment, x, 217-18, 285-302 (see also Antitoxins, Inoculation, Vaccination); ticks as cause of, xii, 98; transmission and history of various, x, 153-70 Infinity, meaning, xi, 191, 196 Inflammations, germ-produced, x, 195; terms used to define, 30 Influence Machines, vi, 292, 298-301, vii, 372; in therapeutics, 236 Influenza, x, 294-5; from chilling, 306; immunity to, 207; present knowledge of, 153, xv, 48 Infra-red Rays, iv, 365, 366