Legs, atrophy of, 290, 309, 343. Lemur volans, 339. Life, 346; conditions of, 292, 294, 302, 305, 310, 400, 414; definitions of, 168, 169, 280. Light, 410. Limbs, atrophy of, 290, 309; genesis of, 421; of seal, 338, 344; whale, 343. Lizard, 313. Local changes, 301. Lyell, Charles, estimate of Lamarck's theory, 71. Mammals, aquatic, 343; flying, 338. Man, as a check on animal life, 288; origin of, 357; origin of language, 370; origin of his plantigrade feet, 365; posture, 362, 368; relation to apes, 362; segregation of, from apes, 369; shape of his skull, 365; sign-language, 368; speech, origin of, 370; swamping effects of crossing in, 320. Medium, 214. Milieu, 214, 416. Mimicry, protective, 220, 221, 225. Minerals, growth of, 164. Mole, 307. Molluscs, 420; eyeless, 309; gasteropod, 348; pelecypod, 417; lamellibranch, 418; Lamarck's work on, 189. Monet, de, 8. Monotremes, origin from birds, 342. Morals, 372. Mortillet, G. de, 30. Mountains formed by erosion, 101, 103. Muscles, adductor, 418. Museum of Natural History, Paris, 34. Mya arenaria, 353, 418. Myrmecophaga, 307. Myrmeleon, 337. Nails, 321. Natural selection. Inadequacy of, 393, 397, 401, 407, 410, 413, 415, 421, 423. Nature, balance of, 207; definition of, 169, 345, 375. Neck, elongation of, in birds, 274, 311, 317; giraffe, 316, 351; ostrich, 317. Needs, 245, 270, 274, 281, 295, 302, 324, 334, 346, 350, 351, 352. Neodarwinism, 422. Neolamarckism, 2, 382, 396, 398, 422. Ophidia, atrophy of legs of, 290, 309. Organic sense, 325, 327, 336. Organs, changes in, 310; origin of, precedes their use, 223; follows their use, 305, 346; atrophy of, 274, 290, 303, 306, 307, 309, 311, 315; new production of, 346, 412, 420. Orang-outang, 364. Osborn, H. S., 403. Ostrich, 317. Otter, 312. Ox, 315. Oyster, 419. Palæontology, 136; Invertebrate, 135, 149. Pallas, 137. Penchants, 281, 293, 328, 331. Perrier, E., 26,411. Petaurista, 338. Philosophy, moral, Lamarck's, 379. Phoca vitulina, 338, 344. Phylogeny, 130. Pigeons, 298; fantail, 304. Planorbis, 387. Plants, changes due to cultivation, etc., 251, 267, 274, 283, 296, 297; cultivated, 298. Population, over-, checks on, 287, 288. Preformation, 162, 218, 222. Propensities, 281, 293, 328, 335, 349, 351. Proteus, 308. Pteromys, 339. Ranunculus Aquatilis, 251, 300. Religion and science, 372. Reptiles, 342. Revolutions of the earth, 109, 142. Rousseau, J. J., 17, 18. Roux, W., 421. Ruminants, 315. Ryder, J. A., 403. Science and Religion, 372. Sciurus volans, 338. Scott, W. B., 403. Sea, former existence of, 109, 110, 148. Seal, 338, 344. Segments, origin of, 421. Segregation, in man, 320, 369.