INDEX 



447 



Formations, intermittent, 269. 

 Formica rufescens, 190. 



sanguinea, 197. 



flava, neuter of, 215. 



Frena, ovigerous, of cirripedes, 



172. 

 Fresh -water productions, dispersal 



of, 344. 

 Fries on species in large genera 



being closely allied to other 



species, 52. 

 Frigate-bird, 167. 

 Frogs on islands, 353. 

 Fruit- trees, gradual improvement 



of, 34. 



in United States, 77. 



varieties of, acclimatised 



in United States, 129. 

 Fuci, crossed, 232. 

 Fur, thicker in cold climates, 121. 

 Furze, 395. 



Galapagos Archipelago, birds of, 



351. 



productions of, 358, 360. 



GaleopithecuB, 163. 



Game, increase of, checked by 



vermin, 63. 

 Gartner on sterility of hybrids, 



221, 222. 



on reciprocal crosses, 232. 



on crossed maize and ver- 



bascum, 242. 

 on comparison of hybrids and 



mongrels, 244. 

 Geese, fertility when crossed, 227. 



upland, 167. 



Genealogy important in classifica- 

 tion, 378. 

 Geoffroy St. Hilaire on balance- 



ment, 133. 

 on 



390. 



homologous organs, 



Isidore, on variability of 



repeated parts, 135. 



on correlation in mon- 

 strosities, 11. 



on correlation, 130. 



on variable parts being 



often monstrous, 140. 



Geographical distribution, 305. 



Geography, ancient, 438. 



Geology, future progress of, 438. 



imperfection of the record, 



250. 



Giraffe, tail of, 175. 



Glacial period, 328. 

 Gmelin on distribution, 328. 

 Gnathodon, fossil, 330. 

 Godwin-Austen, Mr., on the Mala) 



Archipelago, 268. 

 Goethe on compensation of growth, 



133. 

 Gooseberry, grafts of, 235. 

 Gould, Dr. A., on land-shells, 356. 



Mr., on colours of birds, 120. 



on birds of the Galapagos, 



357. 

 — on distribution 



of genera of 



birds, 303. 

 Gourds, crossed, 242. 

 Grafts, capacity of, 234. 

 Grasses, varieties of, 103. 

 Gray, Dr. Asa, on trees of United 



States, 91. 

 on naturalised plants in the 



United States, 104. 

 on rarity of intermediate 



varieties, 158. 



on Alpine plants, 328. 



— Dr. J. E., on striped mule, 



149. 

 Grebe, 166. 



Groups, aberrant, 386. 

 Grouse, colours of, 77. 



red, a doubtful species, 45. 



Growth, compensation of, 133. 

 correlation of, in domestic 



products, 11. 

 correlation of, 129. 



Habit, effect of, under domestica- 

 tion, 10. 



effect of, under nature, 122. 



diversified, of same species, 



165. 



Hair and teeth, correlated, 131. 



Harcourt, Mr. E. V., on the birds 

 of Madeira, 351. 



Hartung, M., on boulders in the 

 Azores, 326. 



Hazel-nuts, 323. 



Hearne on habits of bears, 165. 



Heath, changes in vegetation, 66. 



Heer, O., on plants of Madeira, 

 97. 



Helix pomatia, 357. 



Helosciadium, 323. 



Hemionus, striped, 149. 



Herbert, W., on struggle for exist- 

 ence, 58. 



on sterility of hybrids, 224. 



