Bruguière, J. G., 38, 113. Buffalo, 315. Buffon, G. L. L., 19, 92, 198; factors of evolution, 205, 356; views on descent, 201. Bulla, 348. Callosities, origin of, 203. Camelo-pardalis, 316, 351. Carnivora, 317; origin of, 343. Catastrophism, 105, 117, 126, 146, 153; anti-, 105, 114, 153. Cave life, 390, 392. Cetacea, 343, 409; rudimentary teeth of, 307. Chain of being, 167, 181, 191, 208, 235, 241, 242. Changes in environment, 302; local, 301; slow, 301. Characters, acquired, heredity of, 219, 224, 246, 276, 303, 319. Chimpanzee, 367. Chiton, 348. Circumstances, influence of, 246, 247, 292, 294, 302, 305, 320, 323, 363, 400. Clam, origin of siphon of, 353, 418. Classifications, artificial, 282. Claws of birds, 312; Carnivora, 317, 414. Climate, 204, 218, 244, 283, 400, 402, 416. Coal, origin of, 113, 122. Colonies, animal, 411. Colors, animal, 221. Competition, 236, 287. Conditions, changes of, 292, 294, 302, 305, 310, 400, 407, 414. Consciousness, 325, 326, 353. Cope, E. D., 383, 389. Corals, 115. Correlation, law of, 136, 142, 145; of tertiary beds, 133. Costantin, 416. Creation by evolution, 130. Crossing, swamping effects of, 246, 320. Crustacea, origin of, 341. Cunningham, J. T., 409. Cuvier, George, 66, 140; eulogy on Lamarck, 65; first paper, 185. Dall, W. H., estimate of Lamarck's work, 196. Darkness, influence of, 308. Darwin, Charles, 423, 424; estimate of Lamarck's views, 73; factors tabulated, 356; origin of man, compared with Lamarck's, 371; views on descent, 217, 407. Darwin, Erasmus, factors of evolution, 217, 223, 356; life of, 216. Daubenton, 19, 26, 29, 136. Deer, 316. Degeneration, as used by Buffon, 204, 209; by Geoffroy, 213; by Lamarck, 182, 274, 290. Delboeuf's law, 406. Desiring, 236, 351, 412. Digits, modifications of, 234, 311, 317, 321, 338, 344; reduction of, 315. Direct action of environment, 324, 409, 410, 414, 416. Disuse, 274, 290, 296, 303, 306, 307, 311, 318, 343, 392, 412. Dixon, C., 405. Dogs, tailless, 220; domestication in, 299; races of, 299, 304. Domestic animals, 274, 304. Domestication, effects of, 298, 323. D'Orbigny, A., 386. Duck, 298, 312, 318. Duckbill, 412. Earth, great age of, 119; revolutions of, 109, 147, 150; theory of, 149. Earth's interior, 105. Effort, 213, 234, 257, 295, 339, 348, 351, 353, 354, 370, 411, 420. Egypt, mummied species of, 271, 286. Eigenmann, C. H., 393. Eimer, G. H. T., 408. Elephant, 315. Emotion, 353. Encasement theory, 162, 218, 222. Environment, 214, 410, 417, 421. Epigenesis, 156. Erosion, 101. Evil, 377. Evolution, dynamic, 417; Lamarck's views on, 322. Exercise, 211, 256. Existence, struggle for, 207, 237, 287. Extinct species, 126, 129, 130.