454 



Index. 



Encyclopedia Biilannlca, eighth 

 ed., on instinct, 2*9-291. 



Encys'ation of Protozoa, 115. 



Kndoderm, 137-142. 



Equatorial plate, 129. 



Equus, see Horse. 



Erytkrolanipi-us vennstissimus, 

 33- 



Evolution, organic, fact of, Section 

 I ; Method of, Section II ; ideas 

 upon, prior to Darwin, 253-258; 

 divergent, 266, 267. 



Ewart, Professor Cossar, on electric 

 organ of skate, 364, 367. 



Existence, see Struggle for. 



Eye, of octopus, 57, 58, 347-350; 

 absence of, in dark-cave animals, 

 70-72; nictitating membrane- of, 

 74> 75 5 development of, from 

 cutaneous nerve-ending, 352- 

 354- 



F. 



Feet, 51-59, 66, 77-80, 174-192, 

 K)7. 



Fertilization of ova, 127, 128 ; of 

 flowers by insects, 406. 



Fish, embryology of, 143-155; 

 palaeontology of, 163, 165, 169- 

 171; brain of, 194- 197; distribu- 

 tion of, 224-246; flying, 355. 



Fission, reproduction by, 106, 107. 



Flat fish, 317. 



Float, see Swim-bladder. 



Flowers, fertilization of, by insects, 

 406. 



Fly, imitating a wasp, 329. 



Flying-fish, and squirrels, 355. 



Foraminifera, 346. 



Forbes, H. O., on scapulo-coracoid 

 bones of Dinornis, 60. 



Fortuitous, Darwin's use of the 

 word, 340. 



Fossils, see Palaeontology. 



Frogs, 317. 



G. 



Galapagos Islands, 227-231, 236, 



217. 



Galcus, eye of, 75. 

 Galls, vegetable, 293-295, 446- 



448. 



Gastraea, 137-140. 



Gastrophysema, \ 3S. 



(iastrulation, 137, 140. 



Gegenbaur, 147, 181. 



Gemmation, reproduction by, 106, 

 107, no, in. 



Generalization, 5. 



Generalized types, 33. 



Genesis, classification of organic 

 nature in, 23. 



Genial tubercle, 96. 



Geographical distribution, 204- 

 248: see Glacial paiiod, Barriers 

 Transport of organisms, Oceanic 

 islands, &c. 



Geology, record of imperfect, 156- 

 160, and Appendix ; see Palae- 

 ontology. 



Germs, prophetic, 272, 351-362. 



Gesner, on classification, 24; on 

 canaries, 313. 



Gill-arches, 146, 147, 150, 151. 



Gill-slits, 146, 147, 150-153. 



Giiis, of young salamanders, 102 ; 

 origin of, in embryo, 144 ; of 

 fish, 150, 152. 



Gi.affe, neck of, in relation to 

 Lamarck's theory, 254. 



Glacial periods, effects of, on dis- 

 tribution of plants and animals, 

 209, 210, and Appendix 



Goose, Frizzled, portrait of, 304. 



Gorilla, see Apes. 



Gray, Professor Asa, 337 



Great-toe, in man and apes, 79 81. 



Grouse, 317-319. 



Growth, correlation of, 357, 362. 



Gymnotus, 365, 367. 



H. 



Hack el, on analogy between 

 species and languages, 32 ; on 

 reproduction as discontinuous 

 growth, 105, 106; his ideal 

 primitive vertebrate, 143, 144. 



Hair, vestigial characters of, in 

 man, 89 92. 



Hnles, 3. 



Haller, 3. 



Hamilton, Sir William, 273. 



Hands, 51-55, 66, 80-82,174-192. 



Hare, 318, 319. 



