Eelgrass, fertilization, xiii, 150-1 Eels, xii, 162-3; vinegar and paste, 45 Effector Neurones, xi, 21, 22, 26; in embryo, 34 Efficiency, human, viii, 367, ix, 296, 306; climatic effects, x, 238-9, xiv, 357, xi, 369-82; temperature effects, i, 323-4 Efficiency, industrial, xi, 360, 362, 363 Efficiency of Machines, iv, 192, vi, 214, vii, 367; electric lamps, vi, 268; generators, 357, 379; heat engines, highest attainable, iv, 192; motors, vi, 228; power plants, 380-3; transformers, 317-18; various kinds of engines, v, 155, 161, 164, 170, 172 Egg Cells, production and development of, ix, 332-3, 335, 339, 343-4 Eggs, albuminuria from eating of, x, 345; amino acids in, 278; boiling of, viii, 368; boiling of, on mountains, iv, 170; calories in, ix, 299; composition and use, viii, 364; poisoning from, x, 212; vitamines in, viii, 369, ix, 33, x, 260, 261; white of, composition, ix, 176; white of, digestion of, 233 Egrets, xii, 244, 255 Egypt, antiquity of civilization in, xiv, 196, xv, 84; bats of, xii, 371; buffaloes in, 329; cats of, 355; geographical changes in, xiv, 33; lions of, xii, 359; locust plagues, 109; Nile inundation, xiv, 70-1; Nile valley fertility, 53, 71, 219; Pyramids (see Pyramids); rock weathering in, xiii, 23, xiv, 78-9; snowfall in Lower, i, 210; storks of, xii, 255; ziczac of, 263 Egypt (Ancient), agriculture, xiii, 210; astrology and astronomy, ii, 21, 23-6, xv, 269-70, xvi, 69, 70, 71; baboons in, xii, 380-1; brick-making in, xv, 267 (fig.); calendar, xvi, 70; civilization conditions, xv, 123, 127; crocodile in, xii, 199; dogs of, 346; donkeys in, 308; duck-hunting in, xv, 222; hairdressing in, 255 (fig.); history and civilization, xvi, 53, 65-75; humped cattle of, xii, 330; hunting dog of, 345; irrigation methods, iv, 27 (fig.), v, 18-19, 178, xv, 240; machines, v, 42; medical science, x, 11, 12, 31, xvi, 82; monuments and temples, ii, 24-6, 165; musical instruments, xv, 314, 317, 318, 319; papyrus, v, 289-90; peoples, xvi, 64-5; plague of blood, i, 358; poppy cultivation, xiii, 253; pottery-making in, xv, 249-50, 251 (fig.); sacred ibis of, xii, 255-6; sacred ichneumons of, 352; sailing vessels, v, 182; sciences, xvi, 54-75, 77, 96; scribes of, xv, 177 (fig.); slavery in, 378-9; spinning and weaving in, 243, 244, 245, 246 (figs.); stone-cutting in, 271 (fig.); stone-moving in, 270-1; sun-worship, ii, 20, 23, 24, 25-6; tops, v, 339; water clocks, 58-62; weapons of, xv, 211 (fig.); wheat in, xiii, 210; wheel in, v, 18-19 Egyptian Art, xv, 300-2; no perspective in, xi, 181 Egyptian Comet, ii, 134