---- it is easy to hide our, under such expressions as "plan of creation," or natural selection, 358 Imitation, instinct not referable to, as maintained by Erasmus Darwin, 202 Immutability of species and design commonly accepted together, 9, 10 Improvements, small successive, in man's inventions, 44, 46, 47, 54, 55, 384 Inaccuracy of thought, C. Darwin accused of, 359 Incipiency, of complex structures, a difficulty in the way of the Natural selection view of evolution, 21, 22 Incorporate, the designer is, with the organism, 30 Increase, geometrical ratio of Buffon on the, 123 ---- Lamarck on, 280 ---- Patrick Matthew on, 320, 321 Indefinite, with C. Darwin the variations are, 342, 344 Indifference, I say I am more indifferent than I think I am, whether mind is or is not the least misleading symbol for the cause that sustains the universe, 371 Indirect action of conditions of existence according to Lamarck, 294, 299, 306. (_See_ "Conditions of Existence") Individuality, Buffon on, 128 ---- of buds, Erasmus Darwin on the, 207, 208 ---- our, a _consensus_, or full-flowing river, 318 Infallibility, possible results of the doctrine of Papal, 406 Insectivorous plants, Erasmus Darwin on, 206 Instep, ligament that binds the tendons of the, Paley on the, 22 Instinct, present, does not bar its having arisen in reason and reflection, 53, 54 ---- returns to its earlier phase, _i. e._ to reason on the presence of the unfamiliar, 54, 55, 56 ---- and reason, Buffon on, 110-116 ---- Darwin, Erasmus, on, 115, 116, 204 ---- not referable to imitation, as maintained by Erasmus Darwin, 202 ---- is reason become habitual, 203 ---- reason perfected and got by rote, 256 ---- and reason, Lamarck on, 256, 257, 274 ---- referred to experience and memory, by Patrick Matthew, 322 Insult, "Evolution, Old and New," not intended as an insult to men of science, 392 Interaction of want and power, 44, 45, 47, 217, 218, 221, 300, 323 ---- of body and mind, Lamarck on the, 338, 339, 341 Interesting, the more interesting the animal the more evolution Buffon puts into his account of it, 84 Intermediate forms, Lamarck on, 283, 286 ---- C. Darwin, 284, 285 Inventions, small successive improvements in man's, and development of, analogous to that of organism, 44, 46, 47, 54, 55, 384 Irony, good-natured and the reverse, 91 ---- an apology for, and explanation how far it is legitimate, 111, 112 ---- Buffon's, 78, &c., 91, 92, 93, 155, 157, 163, 164 JARDINE, Sir W., on Buffon's character, 82 Johnson, Dr., and Erasmus Darwin, 184, 185 Joints, Paley on the human, 19, 20 Juggle, Paley's argument a juggle, unless man has had a _bona fide_ personal, and therefore organic designer, 14, 16 KNEE-PAN, Paley on the human, 18 Knowledge, nomenclature mistaken for, 141 LABOUR, glory comes after, if she can, 76 Lamarck, had brain upon the brain, 36 ---- never quite recognized design, 39