Coal Gas, in balloons, v, 223; liquefaction of, iv, 171 Coal Gas Engines, v, 155 Coal Mines, compressed air uses, i, 26 (see also Mines) Coal Series, iii, 344-5; carbonization in, viii, 44 Coal Tar, production and products, viii, 252-4; saving of, 47 Coal Tar Hydrocarbons, as motor fuels, viii, 209 Coastal Plains, xiv, 213-14, 215 Coast Range Mountains, geology of, iii, 89, 94-6, 130, 224, xiv, 127-8, 229 Coast Range Revolution, iii, 224 Coasts, xiv, 246-71; Atlantic and Pacific types, 247-50; compound, 254, 264; cycles of development, 254-5; economic importance, 264-5; emerged, iii, 56-7, xiv, 253, 262-3; hanging valleys on, 57-8; historical effects of, 249-50; neutral, 248, 254, 263-4; photographic mapping, i, 47-8; regular and irregular, iii, 56-7, xiv, 250-3, 255; submerged, iii, 57, xiv, 253, 255-62; wave destruction of, iii, 55-8, xiv, 44-7, 216, 301-3 Coatzacoalcos, harbor of, xiv, 266 Cobalt, viii, 154; affinity strength, 128; atomic weight and symbol, 383; classification place, 178, 183; magnetic susceptibility, iv, 251; ores, viii, 198, 270; specific gravity, 384; test for, 287, 289 Coblenz, Roman name, xiv, 89 Cobras, xii, 226-9; mongooses and, 352 Cocaine, an alkaloid, viii, 240; history and uses, xiii, 254-5; taste sensations reduced by, xi, 72 Cocci, (bacteria), x, 195 Cochineal, source, xii, 112 Cockatoos, xii, 266; Arara, v, 9-10 Cocklebur, xiii, 57 (fig.), 343 Cockroaches, xii, 107; ancient, iii, 279, xii, 104 Cocoa, xiii, 235; American origin, xiv, 382; source, 383; polyuria induced by, x, 344 Cocoa Butter, viii, 246 Coco de Mer, xiii, 60, 154 Coconino Forest, xiv, 373-4, 378 Coconut Oil, ix, 28, xv, 125 Coconut Palm, xiii, 219-20, 244, xv, 125; chatties, intoxication from, xii, 371; on coral islands, 42; fossil found in France, xiii, 319; seed dispersal by, 59, 346 Coconuts, character, uses, and production, xiii, 219-20; double, of Seychelles Islands, 60; gathering of, by monkeys, xii, 378; source and uses, xv, 125; unaffected by sea water, xii, 42 Cocoons, xii, 118 Coction, x, 21, 40 Cod (fish), xii, 163-4; eggs of, 141 Cod Liver Oil, vitamines in, x, 261 Coefficient of Expansion, iv, 145, vi, 265 Coelenterates, iii, 259, 266-7, xii, 26, 33-43 Coelom, xii, 27, 48 Coeur d'Alene Mining District, iii, 362-3, 368 Coffee, history and production, xiii, 231-3; insomnia from drinking of, ix, 219; polyuria induced by, 274-5, x, 344 Cog Wheels, v, 29; screw and, iv, 92, 93 (fig.) Coils, electromagnetic, vi, 92, 93, 98-9; form-wound, 202, 223; induction, vii, 364; primary and secondary, iv, 304, 383, vi, 308, vii, 364; resistance, 364