ue 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 modifica