Egyptians, ancient and modern, xvi, 65; ideas of cosmos, 77; ideas of insanity, x, 356; in Mediterranean group, xvi, 49; not seamen, xiv, 265, 306-7; scarabs of, xii, 123 Ehrlich, Paul, "atoxyl" of, x, 169; chemotherapy founded by, 381; immunity theory, 209, 211-12 Eiffel Tower, hail rods, i, 342, 344; horizontal rainbows seen from, 177 Einstein Theory, ii, 79-82, xvi, 196-8; æther constitution and, vii, 368; anticipations of, xvi, 85; Newtonian system and, iv, 18 Elands, xii, 327 Elasmosaurus, xii, 202 Elastic Cords, vibrations, iv, 216 Elasticity, iv, 35-6, 156-9; molecular, perfect, viii, 24; temperature effects on, iv, 198; vibration dependent on, 198, 213, 215, ix, 98, 100-1 Elation, in various sentiments, xi, 140, 150 Electrical Capacity, iv, 267-8 Electrical Conductors (see Conductors) Electrical Machinery, remote and automatic control, vi, 99-101; ratings, 192-4, 212, 317 Electrical Protective Devices, vii, 32-50 Electrical Terms, vii, 361-76 Electrical Units, iv, 284-5 Electric Arcs, direct currents best, vi, 332; extinguishing of, 102; Faraday's experiments, xvi, 189; heat of, iv, 312, vi, 348; heat and light, 280; on alternating circuits, vii, 208-9; used in nitrogen production, 323-4 (see Arc Process) Electric Batteries (cells), iv, 271-3, 295-300, vi, 58-62, 126-51, vii, 363; chemical action, viii, 167-9; defined, iv, 381, 382; depolarization, vii, 366; direct currents, vi, 154; direction of currents, 59; function, 72; invented by Volta, 18-19; local action, vii, 361; polarization of, iv, 296, 298, 383; primary and secondary defined, iv, 383; used in electrotherapy, vii, 241-4 (see also various kinds of batteries and cells) Electric Bell, iv, 290-2, vi, 99, 127, 138, 144, 306 Electric Breeze, vii, 238-9 Electric Cars, circuit-breakers in, vi, 101-2; construction, types, and operation, vii, 182-6; former and present feeling about, 75-6; growth and improvement, 180; movement on hills, vi, 232-3 (see Electric Traction) Electric Clocks, v, 74