atural Selection compared to a certain kind of, 358

Age, old, the phenomena of, 67, 204, 381

Aggregation, the spirit of the age tends towards, 397, 398

Ahead, no organism sees very far, 44, 48, 54, 384

Aldrovandus, Buffon on the learned, 93

Alive, when we must not say that an animal is alive (to be
retracted), 279

Allen, Grant, on 'Evolution, Old and New,' 386-388

---- on the decay of criticism, 388

---- calls Evolutionism "an almost exclusively English impulse," 393

Alternations of fat and lean years, Buffon on, 125

Amoeba, the, did not conceive the idea of an eye and work towards
it, 43, 44, 384

Analogies, false, all words are apt to turn out to be, 365

Animals, contracts among, Dr. E. Darwin on, 205

Ape, the, and man, 90

Apes and monkeys, Buffon on, 153

---- and children fall on all-fours at the approach of danger, 312

Apparentibus, _de non_, _et non existentibus, &c._, 36

Appearances, rather superficial, our only guide to
classification, 34, 35, 36, 198, 204

Appetency, Paley's argument against the view that structures have been
developed through, 22, 45

Aristides, C. Darwin as just as, 363

Aristotle denied teleology, 4

Artificial and real foot, differences between, 25

Asceticism, virtue errs on the side of excess rather than on that of, 35

Ass, the, and horse, Buffon's pregnant passage on their
relationship, 80, 90, 91, 100, 101, 142, 143, 155, 164, 311

Authority, a hard thing to weigh, 253

BACON, F., on evolution, 69

Balzac, quotation from, on memory and instinct, 67

Bark, Erasmus Darwin's theory of, 208

Beaver, trowel incorporated into the beaver's organism, 8

Bees, neutralization of working, an act of abortion, 250

Beetles, Madeira, Lamarck and C. Darwin's views of their winglessness
compared, 373, 380

Begin, How could the eye _begin_? 46, 47

Beginnings, of complex structures, a difficulty in the way of natural
selection, 21, 22

---- difficulty of accounting for, 46, 47

---- a matter of conjecture and inference, 48

Behind, more moral to be behind the age than in front of it, 401

Best, making the best of whatever power one has, 50

Bird, how birds became web-footed, 48, 49, 51

---- a, will modify its nest a little, under altered circumstances, 55

---- Buffon on, 170, &c.

---- nests, Dr. Erasmus Darwin's failure to connect the power to make
them with memory, 201, 203

---- aquatic and wading, Lamarck on, 30