e 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

Lawyer's deed, if we come across a very intricate, &c., 27

Leopard, the, can change his spots if it becomes worth his while to
try long enough, 40

Lewes, G. H., on embryology, 25

---- his objection to the tentativeness with which the same errors
are repeated generation after generation, 26

---- his objection to C. Darwin's language concerning natural
selection, 346

Lewes, G. H., on natural selection, 348, 349, 359

Life, some remarks about the criterion of, that I must retract, 279

---- one Proteus principal of, 320

"Life and Habit," what I believe to have been its most important
features, 67, 203, 204

---- recapitulation of the main principle insisted on, 37, 56,
203, 380, 381, 384

---- and Hartmann's philosophy of the unconscious, German review, 56, 57

Lifetime, considerable modifications effected during a single, 304

---- the changes undergone by organisms during a single, Herbert