Cranial Nerves, ix, 131, 132, 142, xi, 29-31, 76; doggerel verse on, 214 Crater Lakes, iii, 155, xiv, 101, 203 Craters, formation of, xiv, 101-2; of Hawaiian volcanoes, iii, 104, 105, xiv, 322; of Mount Katmai, iii, 101, (fig.) Crawfish, xii, 87 Creation, ancient conceptions, ii, 366, xvi, 77 Creative Imagination, xi, 225-7 Creepers (birds), xii, 268 Creeping Speedwell, xiii, 28 Creodonts, xii, 332, 339, 366, 375 Creosote, constituents, viii, 333; source, xiii, 255 Crepuscular Rays, i, 169, 370 Cress, xiii, 197, 222 Cresylic Acid, viii, 238, 253, 333 Cretaceous Peneplain, iii, 232 Cretaceous Period, iii, 214-20; animals and plants of, 20, 256-7, 266, 295-6, 292, 297, xii, 154, 202, 210, 242-3, 275; first mammals in, xv, 71 Crete, ancient meteor in, ii, 284; early civilization of, xiv, 281; elevation changes, 33; Phaestos disk, xv, 176 (fig.) Cretinism, x, 350 Crevasses, formation, iii, 63; cirques from, 66 Crex Rugs, xiii, 188, 236 Cribo, (snake), xii, 219 Crickets, xii, 110 Crile, Dr. George W., on emotion effects, xi, 135-6; on fear in animals, 136; on kinetic system, 57-60; on laughter, 355, 356; on pain, 119, 120; on suppressed desires, 141-2 Crime, hypnosis and, xi, 320; of crowds, 329-31; punishment of, among primitive peoples, xv, 369-75, 379-80; street lighting and, vi, 279 Crinoids, xii, 23, 49 Cripple Creek Gold District, iii, 367 Crisis, in diseases, Hippocratic doctrine, x, 21 Critical Period, of crops, i, 248-50, 370 Critical Pressure, iv, 171-3 Critical Temperatures, i, 29, iv, 171-2, viii, 303-4; of various substances, iv, 173 Crocker Land, i, 173 Crocodiles, xii, 182, 196, 198-202; resemblance to tuatera, 184; sleeping sickness due to, x, 169; ziczacs and, xii, 263 Cro-Magnons, xv, 99-102, xvi, 50; art of, xv, 110-21; implements of, 109 Crompton, mule-spinner of, v, 274, 376 Cromwell, sea captain, v, 305 Crookes, Sir William, cathode ray studies, x, 184, xvi, 165, 193; on nitrogen needs, i, 34; theory of fourth state of matter, iv, 54-5, xvi, 193; vacuum tubes named for, iv, 317 Crookes Tube, iv, 317, vi, 114, vii, 251; electron study in, xvi, 193; fluorescence in, iv, 380; phenomena of, 50; X-ray discovery and uses, x, 184, 185 Crop Forecasts, i, 250-2 Crops, critical period, i, 248-50, 370; rotation of, viii, 342-6; sun spots and, ii, 186; weather and, i, 245-50, 252-3 Crossbows, xv, 215 Crosses, inheritance of characters in, ix, 333-7, x, 231-2, xiii, 332 Crossfell, helm and bar of, i, 105, 374 Cross Fertilization (plants), methods to insure, xiii, 120-54; variations due to, 331-3 Croton Bugs, xii, 107 Croton Dam, iv, 119, 120 (fig.) Croup, antitoxin in, x, 298 Crowberry, spread of, xiii, 342 Crow Blackbird, coloring of, xii, 245