Elevation (geological), denudation increased by, xiv, 39, 40; effects on streams, 163, 164-70, 187-8; instances of, 33-4; of coasts, 253, 262; of ocean floor, xiv, 286 (see also Level Changes, Rejuvenation) Elevators, air cushioning, v, 134-5; first passenger, 380; hydraulic, 102-3; motors used, vi, 231, 234; power for fast and slow, 83, 85; sense of giddiness in, xi, 126-7 Elk, xii, 317, 318 Elm Trees, xiii, 194, 271-2 Embroideries, machine-made, v, 285-7 Embryo, development in man and animals, xv, 54, 55; development of human, ix, 343-4; development of nervous system in, xi, 34-6; flexed form of hand, 42-3; gill slits and notochord in, xii, 128; of mammals, 273; of marsupials, 274; past stages of race seen in, xv, 53-4; semiaquatic conditions, xi, 36 Embryo, of plants, xiii, 60 Embryological Development, x, 228 (see Embryo) Embryology, history, xvi, 107, 156 Emeralds, iii, 325; oriental, 327 Emergencies, body responses in, ix, 166-7, 171-2, 209, 220, 221, 293 Emerson, metaphor of, i, 187; on common mind, xi, 152; on narrowness of men, 376 Emery, iii, 327-8 Emmet, Thomas, x, 122, xvi, 186 Emotional Glycosuria, xi, 138 Emotions, xi, 129-42; associations determined by, 205-6; brain processes in, ix, 154; classes of, 153-4; combinations in sentiments, xi, 146-50; expression of, in men and animals, xv, 63-5, 152; fatigue and, xi, 274-6; hypnotic suggestion of, 317-18; in crowd psychology, 331-2; not localized in body, 62; pain and, 119, 120; physiological effects of, ix, 163-7, 171-2, 200, 209, 240-1, 348, x, 339, 353; primary varieties, xi, 55-6; suppression of, 140-2 (see also Suppressions) Empathy, xi, 172-3, 186; in advertising, 346-7; in salesmanship, 335 Empedocles, atomic theory, xvi, 87; malaria prevention by, x, 154; on matter, xvi, 83, 118 Empiric Doctrine (medicine), x, 24, 28 Emu, xii, 243, 249, xv, 194 Emulsions, colloidal state, viii, 314, 316, 356; defined, ix, 289 Encke's Comet, ii, 280; used to find Mercury's weight, 77 End Buds, of fishes, xii, 137 Endless Screw, v, 38, 37 (fig.) Endocarditis, x, 195, 332 Endoderm, xii, 26 Endoskeleton, xii, 127 Endothelial Cells, x, 197, 210