Cats, xii, 354-56; body heat, conservation of, ix, 307; embryological resemblance to dog, xv, 54; hair erection in, ix, 161, 164; instincts of, xi, 48 Catskill Aqueduct, v, 262, 263-5 Catskill Formation, iii, 195 Catskill Mountains, formation, iii, 139, xiv, 179, 225; New York water supply from, xiv, 140; section of, iii, 138 (fig.); stream piracy in, xiv, 179-80 Cat-tails, xiii, 59, 181, 187 Cattle, domestic, origin of, xii, 330; elastic cord in neck, ix, 59; hornless, breeding of, 327; salt consumed by, viii, 140; surra disease of, x, 168; tetanus germ in, 298-9; tick diseases of, xii, 98; ungulates, 300; young of, ix, 346 Cattle Family, xii, 324-31 Cattle-raising, on grasslands, xiv, 383-4 Cattle-Raising Stage, xv, 187, 196-9 Caucasus Mountains, iii, 236; Ice Age in, 240; recent formations, xiv, 235 Cauliflower, a modified bud, xiii, 41; in mustard family, 197; origin, 222; sport plant, 333-4 Caustics, x, 255 Caustic Soda, viii, 278 Cauterization, batteries used, vii, 242; former use of, x, 38, 55, 56 Cavalieri, Bonaventura, xvi, 104, 119 Cave Bear, xiv, 149; cave pictures of, xv, 110 (fig.); relics of, 79, 82, 100 (fig.) Cave Fishes, eyes of, xii, 138 Cave Lions, xii, 359 Cave Men, xv, 76-84, 88-102; art of, 148-9, xv, 110-20, 298, 299, 300; clothing of, 257; life of, 188-91; tools and weapons, 102-10 Cavendish, Henry, chemical work, xvi, 120, 121, 177; electrical work, vi, 16, 17, xvi, 121; experiment to prove gravitation, iv, 98; hydrogen discovery, results, x, 89 Cavendish Experiment, ii, 68 Caves, Caverns, formation in limestone, iii, 127, viii, 151, xiv, 147-8; importance in history of man, 148-9, xv, 266; primitive life in, 80-1, 82-3; wind-eroded, iii, 73 Caviar, acquired taste for, xi, 72; sources of, xii, 151, 152 Cavies, xii, 289 Cavitation, v, 235-6 Cayuga, Lake, xiv, 203 Cazorla, Spain, hailstorm, i, 119 Ceiling, of aeroplanes, i, 303 Celebes, xiv, 274; animals of, xii, 310, 330, 379 Celery, blanching of, xiii, 76; calories in, ix, 299; family, xiii, 200-1; origin and antiquity, 222 Celestial Equator, ii, 70 Cell Metabolism, ix, 37-40; oxygen requirements, 182, 199, 253, 254, 260; part of cell engaged in, 42-3; sugar and fat supplies, 289; supply system, 49-52 (see also Metabolism, Basic Metabolism, Functional Metabolism) Cells (electric) see Electric Cells