---- Haeckel's surprising statement concerning, 73 ---- wherein he mainly differs from Buffon, 105 ---- memoir of, 235 ---- his connection with Buffon, as tutor to his son, &c., 237, 258 ---- his daughters, 242, 253 ---- his poverty and blindness, 242, 253 ---- Isidore Geoffroy on, bad caricature of his teaching, 244-246 ---- Haeckel on, 246, 247 ---- never seriously discussed, 247 ---- "the well-known doctrine of," C. Darwin's reference to, 249, 250, 251, 298, 314, 376 ---- on the opposition his theory met with, 252 ---- too old to have begun his unequal contest, 253 ---- on the feeling of animals, 254, 255 ---- too theory-ridden, 254 ---- misled by Buffon (query), 255 ---- took from Buffon without sufficient acknowledgment, 255, 258, 260, 311 ---- as compared with Dr. Erasmus Darwin, 257 ---- like Dr. E. Darwin, sees struggle and modification turn mainly round three great wants, 257, 279, 300, 309 ---- when and how he came over to the side of mutability, 258 ---- and the French translation of the "Loves of the Plant," 259 ---- on comparative anatomy, 266 ---- on species, 267, &c. ---- on conditions of existence (_circonstances_), 105, 268, 270, 271, 275, 277, 278, 281, 291, 292, 294, 295, 298, 299, 300, &c. ---- on instinct, 274 ---- on animals and plants under domestication, 275, 293, 296, 297, 300 ---- on extinct species, 277 ---- anticipated Lyell in rejecting catastrophes, 277 ---- on the geometrical ratio of increase and struggle for existence, 280-282 ---- on embryonic development, 289 ---- the main principles which he supposes to underlie variations, 292, 299, 338, 339 ---- his contention that plants have neither actions nor habits, 295 ---- on use and disuse, 294, 296, 299, 301, 302, 304, 305, 307-309 ---- on the various breeds of the dog, 297 ---- habit a second nature, 300 ---- like Erasmus Darwin and Buffon, understood the survival of the fittest, 301 ---- on the way in which serpents have lost their legs, 303 ---- on wading and aquatic birds, 305 ---- on the eyes of flat fish, 307 ---- on man, 311, &c. ---- on a single instance of considerable variation under domestication, 311 ---- on speech, 313, 314 ---- on the upright position of man and certain apes, 313 ---- his, and Etienne Geoffroy's views on conditions of existence, 326, 327, 328 ---- his hypothesis, and Isidore Geoffroy, 329 ---- Herbert Spencer on, 330, 331 ---- desired to discover the law underlying variations, 337 ---- the extent to which he and C. Darwin take common ground, 335-337 ---- on body and mind, 338, 339, 341 ---- on his theory variations will be definite, will appear in large numbers of individuals at the same time, for long periods together, 341 ---- how he and C. Darwin treat the winglessness of Madeira beetles respectively, 373-380 ---- on the eyes and ears of cave-inhabiting animals, 378, 379 Laputan method of making books, the, and natural selection, 11