---- danger of, 360, 368 Scramble, birds learned to swim through scrambling, 48, 51 Self-indulgence, virtue has ever erred rather on the side of, than on that of asceticism, 35 Sensation, Buffon on, 126, 129 Sense, "in one sense," 355 Sensitive plants, Dr. E. Darwin on, 206, 210 Seriously, Buffon speaking, 126 Serpents, how it is that they have lost their legs, 302 Seward, Miss, her life of Erasmus Darwin, 174, &c. Shakspeare and Handel address the many as well as the few, 81 Shortest day, and shortest day but one, no difference perceptible between, 48 Skeletons, the, of man and of the horse, 88, &c. Skill, the unerring, of natural selection, 9 Siamese twins, desire and power compared to, 218, 300 Simplicity, happy, an example of, 276 Sisters, "his, and his cousins and his aunts," 253 Slit, a slit in one tendon to let another pass through, 20 Something a man should do, no matter what, 51 Sometimes, "equally convenient" ("the survival of the fittest" with natural selection), 9, 354, 365 Son, the people who can get good sons and retain their affection are the only ones worth studying from, 76 Sorbonne, the, and Buffon, 82, 84 Sorbonnes, never do like people who write in this way, 143 Specialists, embryos are, 28 Species, Buffon on the causes or means of transformation, 159, &c. ---- Lamarck on, 267, &c. ---- clusters of, Lamarck on, 288 ---- C. Darwin on, 289 Specific characteristics vary more than generic, Lamarck on, 287, 288 ---- C. Darwin on, 288 Speech, Lamarck on, 313, 314 Spencer, Herbert, on Lamarck's hypothesis, 330, 331 ---- a follower of Buffon, Dr. Erasmus Darwin and Lamarck, 332 Spent, or extinct purpose, and rudimentary organs, 383 Spontaneous: C. Darwin uses this word in connection with variability, 358 ---- variability (or unknown causes), C. Darwin, on what it will account for, or make known, 358 Steam engine, latest development of, not foreseen, though each immediate step in advance was so, 54, 384 ---- design lost sight of in the most common patterns, as with a bird's-nest, or the wheel, 55 Step, if each step is purposive, the whole road has been travelled purposively, 52, 384 ---- only the few nearest are taken definitely, 44, 384 Sterility of hybrids, Lamarck on, 272 ---- C. Darwin on, 273 Stock, Buffon on the, and the diaphragm, 130 Stronger, the, succeed, and the weaker fail, 320, 321 Strongest, the, eat the weaker, 282 Struggle for existence, Buffon on the, 123 ---- and hence modification, according to Dr. Erasmus Darwin, mainly conversant about three wants, 226-229, 232 ---- comparison between Erasmus Darwin and Lamarck's views on the foregoing, 257 ---- Lamarck on the foregoing, 279 ---- and survival of the fittest, Lamarck on the, 281, 282 ---- Patrick Matthew on, 321 Style, Buffon on, 76, 77 Sudden, the question what is too, to be settled by higgling and haggling, 50 ---- modifications, missionaries should avoid trying to effect, 183