foods of, viii, 349, 350, ix, 24, 29, 30; food procuring by, 18-20, 73-4; geological history, iii, 12, 259, 306; grasping ability of, ix, 67, 68, 82; growth of, on what dependent, 287-9; hair erection in, 161, 166; heredity in, x, 231-2; hoofed, xii, 300-31; hunger and thirst senses in, ix, 87; hunting and trapping of, xv, 222-7, 227-8; hypertrophy of heart in, x, 331-2; imagination in, xi, 224; imitation in, xv, 66; impulses instinctive, 273; instincts of, 65-6; land (see Land Animals); later than plants, xiii, 298; Latin names, xii, 28-9; leadership among, xv, 361; light and darkness effects on, x, 253; locomotion, v, 215, ix, 73-4; luminous, i, 346-7; man's lessons from, xv, 206, 208, 220; man's relation to, 53, 68; marine (see Marine Animals); "moral standards" applied to, xii, 351; mutation in, ix, 342; nitrogen uses, viii, 73; of continental islands, xiv, 271; of oceanic islands, 277-8; oldest known remains, iii, 238, (Pl. 13); physiology of, remarks on, ix, 305; plants and interrelations, viii, 334, 335, 347, 349, 350, xiii, 82; power development in, ix, 15, 16, 17, 18; protective devices, xv, 16-18; qualities, studies of, xvi, 143; rate of increase, xv, 19-21; reason in, xi, 243-4, xv, 67-8; reflex actions in, 65; regulatory mechanism in, x, 249-50; reproduction from cells, 228, xvi, 155-6; salts in body fluids, ix, 175-6; seasonal phenomena, i, 254, 256; seed dispersal by, xiii, 55, 58, 340, 343; sense of sight in, ix, 105; sense of smell in, 96-7, xi, 82; sex relations among, xv, 274, 276-7; smelling motions in, ix, 82-3; struggle for existence among, xv, 21-2; tool-using by, v, 9-11, x, 67-8; touch sense in, 91; unicellular, (see Unicellular Animals); useful, xii, 324-31; variation in, xv, 22-3 (see Variation); vitamine needs and stores, x, 256-60; warm and cold blooded, ix, 305; water scarcity effects, 37-8; wild, xii, 332-65; young, metabolism in, ix, 38-9 Animal Starch, viii, 350 Animal Worship, xv, 333-4, 340-1 Animists, Animist Theory, x, 84-5 Anion, defined, iv, 381 Annuals (plants), xiv, 367; garden species, xiii, 289, 297; life of, 53, 152; roots of, 15, 16 Anoa, of Celebes, xii, 330 Anode, defined, iv, 317, 381, vii, 251, 362; first defined by Faraday, vi, 23 Antarctica, blizzards of, i, 133; coal deposits, 199; extent and elevation, xiv, 20, 22, 26; former connection with S. America, 290; glaciers of, 55; island or continent, 23; plateau, 222; penguins of, xii, 251; rainlessness, i, 109; uninhabitability, xiv, 21; winds of, i, 128-9 Antarctic Ice Sheet, iii, 62, 237 Antarctic Ocean, current of, xiv, 299, 305; extent of, 22-3; sea elephant of, xii, 335; whales of, 298