Impulsiveness, of motor type men, xi, 157, 158-9; will and, 264 Inanition, x, 275-7, 279 Inattention, xi, 25, 236 Inbreeding, in plants, xiii, 119-20 Incandescent Bodies, spectra of, ii, 112-13, iv, 360-3 Incandescent Lights, iv, 311 Incas of Peru, civilization in temperate climate, xv, 123; corn in tombs, xiii, 212; hunts of, xv, 222; quipus of, 165, 166, (fig.) Inclined Plane, iv, 90, v, 35-41; primitive use of, iv, 24 Index of Refraction, in chemical analysis, viii, 310 Index Plants, i, 255 India, aborigines in black race, xv, 37; aconite used as poison, xiii, 252; adjutant bird of, xii, 255; aerial photographic service, i, 46; ancient astronomy, ii, 25, 26, xvi, 57; ancient meteorology, i, 68, 213; ancient science, xvi, 54, 62; ancient sun-worship, ii, 23-4; animals (carnivora), xii, 337, 340, 344, 345, 359, 365; animals (herbivoral), 302, 303, 305, 308, 320, 327, 328, 330; artificial ice in ancient, v, 349; banana plants, xiii, 216; betel nut, 254; brontides, i, 195; bubonic plague in, x, 164, 165; Catalan forges in, v, 315; cinnamon growing, xiii, 264; civilization and climate, xv, 123; coco palm of, 125; copra production, xiii, 220; cotton production, 237, 238; cradle of human race, xvi, 47; crocodiles of, xii, 199, 201; deer-hunting in, 365, xv, 223; dust whirlwinds, i, 60; earthquake of, xiv, 333 (see Great Indian Earthquake); famines, xiii, 214; forests, government-controlled, 372; former trade routes, xiv, 307, 309; glacial deposits, iii, 203; hailstorms, i, 120; Himalayas as protection to, xv, 137; ideas of eclipses, ii, 209; jungle fowls of, xii, 261; jute production, xiii, 241, 243; monkeys of, xii, 379; monsoons, importance, i, 66-7, 131, 218, xiv, 350-1; monuments and records, ii, 24; music of, xv, 314 native marriage customs, 282; peoples and civilization, xvi, 53-4; pipal tree, xiii, 108; plains of, xiv, 47, 217; polyandry in, xv, 286; poppy growing, xiii, 253; quinine production, 251; rainy seasons, xiv, 352; rattan palm, xiii, 27, 361; religious cults, ix, 266; religious philosophy, xi, 116; rice in, xiii, 213; rivers of, xiv, 195-6; rubber growing, xiii, 247, 248; serpents of, xii, 214, 219, 228-9, 231; smallpox inoculation in, x, 100; sugar production, xiii, 215; Suttee in, xv, 335; tarpon of, xii, 154; tea cultivation, xiii, 228; telegraph plant, 114; tobacco production, 258; tortoises of, xii, 191; weather conditions, distant causes, i, 241; wine palm, xiii, 53 (see also Hindus) Indiana, glacial drift in, xiv, 69, 170; limestone quarries, iii, 371-2; prairies of, xiv, 373