Head, binding of, among savages, xv, 260; blood supply of, ix, 197; bones of, 61-3; motions and position, how sensed, 90; saving heels by, xi, 376-7; shape in race classification, xv, 42-3; washing of, x, 312; word, various uses of, xv, 158-9 Headaches, electrical treatment, vi, 285, vii, 238-9; eyestrain and, ix, 113; hypnosis and, xi, 315; significance of, 120-1 Head of Water, v, 94; high and low, 79-81 Health, care of, instruction in, x, 282-5 (see also Personal Hygiene); dependent on kinetic system, xi, 61; emotions and, 129; mental efficiency and, 369; regulation to environment, x, 249-50; resistance to disease strengthened by, ix, 185-6; Science of, vol. x; worry and, ix, 167 Health Resorts, i, 331 Hearing, iv, 203-4, 211-12, ix, 98-103, xi, 98-108; "arrival platform" for, ix, 146; colored, xi, 222; direction perception by, ix, 117, 120; distance perception by, 121; ear movements and, 82; in fishes, xii, 137-8; in insects, 101; limits (vibration rates) of, iv, 204, ix, 99, 100; nerve of, 30; organ of, position, ix, 61; sense of, in infants, 351; space perception by, xi, 163, 167-9 Heart, anatomy and operation of, ix, 200-12; of, x, 332, 333-4; as seat of affections, ix, 200; emotion effects on, ix, 200, xi, 135, 136-7; emotions attributed to, 130-1; examination methods, ix, 205; exercise effects, 261-2, x, 303, 304-5; fatigue effects, xi, 272; fear and terror effects, 131, 132; high temperature effects, x, 251; hypertrophy of, 331-2; motions, Harvey on, 64-6; nerve centers and control, ix, 168; part in maintenance of life, 21-3; passage of blood through former ideas, x, 52, 62, 65-6; removed from body, beating of, ix, 84; rest and sleep needs (eight-hour day), 209-10; septum of, x, 66, 113; sleep effects, xi, 283; sounds, how listened to, ix, 205-6, x, 108-9; supposed "pores" of Galen, 52, 62, 65-6; systole and diastole, 64-5, 109; valves of, ix, 202, 204, 206-7, x, 332; work of, how measured, ix, 213-14 Heart Beat, ix, 202-3; adrenalin effects, 171, 172, 209; chemical theories of, x, 84; control through nerve centers, ix, 168; disturbances of, x, 333; emotion effects, ix, 166, 209; exercise effects, 168-9, 207, 208-9, 261-2; rate of, 203, 204-5, x, 334; rate increased by heat, 251; rate in infants, ix, 347; sounds of, 205-6; variations in rate and vigor, 207-10 Heartburn, ix, 232 Heart Disease, atmospheric conditions best for, x, 241; digitalis in, 333, 383; early ignorance, xvi, 180-1; modern therapy of, x, 382-3; rheumatism and, 224; valvular, 332 Heart Failure, x, 333; symptoms accompanying, 340-1, 344