Index. 



453 



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, 



39'. 392, 394-396, 408-410. 



448-450. 

 Colouring, see Recognition marks, 



Protective, Seasonal, Warning, 



and Mimicry. 

 Congenital characters, see Charac- 



teis. 

 Conjugation, of Protozoa, 115- 



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 palseontological 

 development of feet, vertebral 

 column, and brain, 197. 



Correlation of growth, 357 362. 



CossonidcE, 233. 



Courtship, see Sexual Selection. 



Crabs, 62-65, ^39- 



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, 1-9; 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 geogiaphical dis- 

 tribution, 218, 219 ; on fauna of 



the Galapagos Archipelago, 227, 

 228; on natural selection, 252, 

 2.S3, 255, 256, 2S6, 375, 376; 

 his use of such words as ' 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 CandoUe, on classification, 34. 



Deer, 98, 99, 167-169, 187, 191, 

 196, I. ,8, 199. 



Degeneration, 269, 270, 342. 



Delamination, 139. 



Diadet?ia euryta, 330, 



Diaster. 129-133. 



Dingo, see Dog. 



Diiiornis, 60, 61. 



Diptera mimicking Hymenoptera, 



329- 

 Dog, dentition of, 39 ; Dingo, 304 ; 

 domesticated varieties of, 305, 

 307 ; hairless, 307 ; skulls of, 



307- 

 Duck, logger-headed, 68. 

 Dugong, eye of, 75. 



E. 



Eagle, eye of, 75. 



Ear, of whnles, 65 ; vestigial 

 features of human, 76, 86-89; of 

 man and apes compared, 88. 



Eaton, Rev. A. E., on wingless 

 insects, 70. 



Echinodervtata, 125-127, 138, 



155- 



Ectoderm, 137-142. 



I'gg, see Ovum. 



Eimer, 363 



Elaps fulvius imitated by non- 

 venomous snakes, 330. 



Electric organs, 365-373. 



Elephant, foot of, 185, 186 ; rate 

 of propagation of, 261, 262. 



Elk, 1 96-1 98, 199. 



Embryo, human, see Man. 



Embryogeny, see Ontogeny. 



Embryology, 98-155. 



Embryos, comparative series of, 

 152. 153- 



