e? show him to us," &c., 29, 30

---- the, of any organism, the organism itself, 30, 31, 40

Desire and power, interaction of, 44, 45, 47, 127, 217, 221, 300, 322

---- and power, like wealth, 222

---- as a means of modification, Dr. Erasmus Darwin on, 226, 228, 259

Development, the history of organic, the history of a moral struggle, 45

---- always due to making the best of the present, 50

Devils, 20,000, dancing a saraband on the point of a needle, 216

Dew drop, or lens, the, and Lord Rosse's telescope, 44, 47

Diaphragm, Buffon on the, 129

Dice, accidental variations thrown for as with, 3

Difference between animal and ordinary mechanism, 24

---- the main, between the manufacture of tools and that of organs, 39

Dilemma, C. Darwin's, 346

Direct action of changed conditions, Buffon on the, 105, 145, 147, 160

Discontinuity in continuity, 47

Disease, accidents followed by, 303

Disintegration, Protestantism tends towards, 397

Distribution, geographical, changed, Buffon on, 145, 164

Disuse, and the winglessness of Madeira beetles, we are almost surprised
to find that they are connected at all, 375

---- the main agent in reducing the wings of Madeira beetles, 377

---- some examples of the effect of, adduced by Lamarck, 378

Dog, Buffon on the, 120

---- Lamarck on the various breeds of the, 297

Domestication, a single case of a species formed under domestication
sufficient to remove the _a priori_ difficulty from a
comprehensive theory of evolution, 90, 91, 311

---- plants under, Buffon on, 167, &c.

---- Buffon on animals under, 103, 120, &c., 148, &c., 159, &c., 276

---- animals under, Dr. Erasmus Darwin on, 223

---- animals under, Buffon on, 121, &c., 148, 276

---- C. Darwin on, 276

---- animals and plants under, Lamarck on, 275, 293, 296, 297, 300

---- animals and plants under, Mr. Patrick Matthew on, 324

Door, the doing anything well will open the door for doing
something else, 51

Ducks, our domesticated, why they cannot fly like wild ones, 296, 309

EARN, "you are but doing your best to earn an honest living," 29

Ears are never found in a rudimentary condition, 379

Eat, or be eaten, 177

Effort, Paley's argument that structures have not been developed
through, 22, 45

---- too much, as vicious as indolence, 35

---- "neither too much nor too little," 50

---- Herculean, condemned, 197

Egyptian mummies, Lamarck on, 274, 275

Emb