Index. 
racters in relation to, 34, 35, 
38, 39; chains of affinities in 
relation to, 39-40; biological® 
differs from astronomical, 43. 
Cockerell, on vegetable galls, 
447, 448. 
Colours, of plants and animals in 
relation to the theory of natural 
selection, 317-332; in relation 
to the theory of sexual selection, 
391, 392, 394-399, 408-410, 
448-450. 
Colouring, see Recognition marks, 
Protective, Seasonal, Warning, 
and Mimicry. 
Congenital characters, see Charac- 
ters. 
Conjugation, of Protozoa, 115- 
117. 
Continuity, principle of, in nature, 
15-21. 
Contrivance, Darwin’s use of the 
word, 281. 
Co-operation, mutual, of species 
alleged, 445-448. 
Co-operative instincts, due to 
natural selection, 267, 269. 
Cope, Professor, his table of geo- 
logical formations, 163, 164; 
his table of palzontological 
development of feet, vertebral 
column, and brain, 197. 
Correlation of yrowth, 357-362. 
Cossonid@, 233. 
Courtship, see Sexual Selection. 
Crabs, 62-65, 139. 
Cuttle-fish, 317. 
Cuvier, on method in natural 
history, 3-4; on monkeys, 429. 
Cyst, see Encystation. 
D. 
Darwin, Charles, his influence on 
ideas of method, 1-g; on classifi- 
cation, 35, 36, 39, 40; on ves- 
tigial characters in man, 77, 86, 
87, 92; on imperfection of 
geological record, 165, and Ap- 
pendix; on means of dispersal, 
216, 218; on geographical dis- 
tribution, 218, 219; on fauna of 
453 
the Galapagos Archipelago, 227, 
228; on natural selection, 252, 
253, 255, 256, 286, 375, 376; 
his use of such wordsas ‘accident,’ 
‘fortuitous,’ ‘purpose,’ ‘ contri- 
vance,’ &c., 281, 334-340: on 
sexual selection, 379-400. 
Darwin, Erasmus, his theory of 
evolution, 253. 
De Blainville, on the theory of 
descent, 258. 
De Candolle, on classification, 34. 
Deer, 98, 99, 167-169, 187, 191, 
196, 1y8, 199. 
Degeneration, 269, 270, 342. 
Delamination, 139. 
Diadema euryla, 330. 
Diaster, 129-133. 
Dingo, see Dog. 
Dinornis, 60, 61. 
Diptera mimicking Hymenoptera, 
329. 
Dog, dentition of, 39 ; Dingo, 304 ; 
domesticated varieties of, 305, 
307; hairless, 307; skulls of, 
3°7- 
Duck, logger-headed, 68. 
Dugong, eye of, 75. 
E. 
Eagle, eye of, 75. 
Ear, of whales, 65; vestigial 
features of human, 76, 86-89 ; of 
man and apes cumpared, 88. 
Eaton, Rev. A. E., on wingless 
insects, 70. 
Echinodermata, 
155. 
Ectoderm, 137-142. 
lgg, see Ovum. 
Eimer, 363. 
Lilaps fulvius imitated by non- 
venomous snakes, 330. 
Electric organs, 365-373. 
Elephant, foot of, 185, 186; rate 
of propagation of, 261, 262. 
Elk, 196-198, 199. 
Embryo, human, see Man. 
Embryogeny, see Ontogeny. 
Embryology, 98-155. 
Embryos, comparative series of, 
152, 153. 
125-127, 138, 
