East Africa, ancient dinosaurs of, xii, 195; clan ceremonies in, xv, 363; development of, 136; glaciers in, xiv, 54; Great Rift Valley, 118-20, 121; lava fields and volcanoes, 103, 317 East Indies, animals of, xii, 145, 288, 352, 353, 359, 362, 370; beriberi in, x, 257; chocolate growing, xiii, 234; land and sea breezes, i, 131; nautilus of, xii, 75; nutmeg production, xiii, 261-2; Portuguese and Dutch in, xiv, 310; rattan palm of, 368; smallpox inoculation in, x, 207; spices from, xiii, 259; wild arum of, 153 East River, pipe-thawing under, vii, 338-9 Eastport, Maine, tide at, xiv, 293 Eating, effect of excitement during, xi, 374-5; kinaesthetic sensations in, 127; metabolism increased by, x, 271; obesity and, 273 Eccentric, of steam engine, v, 40-1 Echidnas, xii, 272-3 Echinoderms, iii, 259, 268-70, xii, 48-50 Echoes, iv, 237-9; aerial, i, 190, 193 Eclipses, ancient studies of, ii, 9, 32, 37; annular or ring, 214; elements of, 216; of Jupiter's moons, 263; of moon, 206-8; of sun, 209-18 (see also Solar Eclipses) Ecliptic, ii, 162, 350; plane of, 70, 163; poles of, 92; trepidation of, 38 Ecology, xiii, 354-7 Economic Botany, xiii, 208-66 Economic Geology, iii, 342-76, xvi, 172-4 Ectoderm, xii, 26 Ecuador, glaciers in, xiv, 54; yellow fever in, x, 160, 172-3 Eddies, wind, i, 292, 294, 371 Eddington, astronomer, ii, 17, 330, 341, 342, 347, 348-9, 354, 356, 382; quoted, 151, 320, 344, 384; "Stellar Movements," 319 Eddy Currents, vi, 192, vii, 365-6; in various machines, vi, 213, 225, 316 Edinburgh University, medical school, xvi, 179 Edison, carbon lamp, v, 381; carbon lamp filaments, xvi, 189; carbon microphone, v, 381; early dynamos, xvi, 188; electrical work, vi, 26; father of electric lighting, vi, 265; first incandescent lamp, xvi, 188; kinetoscope, v, 330; phonograph, 328, 381; quadruplex telegraph system, vii, 112; storage battery, vi, 149-51; vacuum tube discovery, vii, 276; Edison Closed Circuit Cell, vi, 137 Edison Electric Company, load factors, vi, 381-2; storage battery reserves, 382-3; tied with Interborough System (N. Y.), 384 Edison-Lelande Cell, vi, 139-40 Edison Storage Battery, vi, 130, 149-51 Education, association principle in, xi, 200-1, 203, 204; botanical, xvi, 22; environment in, xi, 249; grasping reflex, importance, 43; hygienic, x, 282-5; imitation in, xv, 66-7; importance of choices in, xi, 266-7; language and, xv, 145-6; modern, a summary of past, 145-6, 164; modern, beginnings, xvi, 111; necessity of, ix, 344, 352; progress in relation to, xv, 30-1, xvi, 47; reaction speeds, xi, 158, 159; sensation as, 68; Spencer on, x, 282, 284; waste of time in spelling, xv, 177; (see also Learning Processes)