544 



INDEX 



Forests, changes in, in America, 88. 

 Formation, Devonian, 382. 



, Cambrian, 360. 



Formations, thickness of, in Britain, 



338- 

 , intermittent, 348. 



Formica, rufescens, 277. 



, sanguinea, 276. 



, flava, neuter of, 293. 



Forms, lowly organised, long endur- 

 ing, 136, 137. ^ . . , 



Frena, ovigerous, of cirnpedes, 196. 



Fresh-water productions, dispersal 

 of, 427. 



Fries, on species in large genera 

 being closely allied to other spe- 

 cies, 73- 



Frigate-bird, 189. 



Frogs on islands, 436. 



Fruit-trees, gradual improvement of, 



51- 



in United States, 98. 



, varieties of, acclimatised in 



United States, 154. 

 Fuci, crossed, 308, 314. 

 Fur, thicker in cold climates, 146. 



Galapagos Archipelago, birds of, 



434. ^ . 



, productions of, 439, 440. 



Galaxias, its wide range, 427. 



Galeopithecus, 185. 



Game, increase of, checked by ver- 

 min, 84. 



Gartner, on sterility of hybrids, 299, 

 300, 305. 



, on reciprocal crosses, 308. 



, on crossed maize and verbas- 



cum, 325. 

 -, on comparison of hybrids and 



mongrels, 327, 328. 



Gaudry, Prof., on intermediate gen- 

 era of fossil mammals in Attica, 

 378. 



Geese, fertility when crossed, 304. 



, upland, 189. 



Geikie, Mr., on subaerial denuda- 

 tion, 336. 



Genealogy, important in classifica- 

 tion, 457. 



Generations, alternate, 478. 



Geoffroy St. Hilaire, on balance- 

 ment, 158. 



, on homologous organs, 473. 



, Isidore, on variability of re- 

 peated parts, 160. 

 -, on correlation, in monstrosi- 



ties, 29. 



, on correlation, 156. 



, on variable parts being often 



monstrous, 165. 

 Geographical distribution, 395. 

 Geology, future progress of, 527. 

 , imperfection of the record, 



527. 



Gervais, Prof., on Typotherium, 378. 



Giraffe, tail of, 206. 



— • — , structure of, 230. 



Glacial period, 411. 



, affecting the North and South, 



415- 

 Glands, mammary, 244. 

 Gmelin, on distribution, 412. 

 Godwin-Aui^ten, Mr., on the Malay 



Archipelago, 352. 

 Goethe, on compensation of growth, 



158. 

 Gomphia, 227. 

 Gooseberry, grafts of, 311. 

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



438. 



, Mr., on colours of birds, 146. 



, on instincts of cuckoo, 273. 



, on distribution of genera of 



birds, 445. 

 Gourds, crossed, 325. 

 Graba, on the TJria lacrymas, 105. 

 Grafting, capacity of, 310, 311. 

 Granite, areas of denuded, 345. 

 Grasses, varieties of, 124. 

 Gray, Dr. Asa, on the variability of 



oaks, 66. 

 , on man not causing variabil- 

 ity, 93- 



, on sexes of the holly, 107. 



, on trees of the United States, 



113- 



, on naturalised plants in the 



United States, 125. 



, on KStivation, 226. 



, on Alpine plants, 412. 



, on rarity of intermediate va- 

 rieties, 182. 



■, Dr. J. E., on striped mule. 



171- 

 Grebe, 189. 



Grimm, on asexual reproduction, 

 ^ -^78. , 



Groups, aberrant, 468. 

 Grouse, colours of, 98. 



, red, a doubtful species, 64. 



Growth, compensation of, 158. 

 Giinther, Dr., on flat-fish, 244. 



, on prehensile tails, 244. 



, on the fishes of Panama, 396. 



, on the range of ftesh-water 



fishes, 427. 

 , on the limbs of Lepidosiren, 



492. 



H 



Haast, Dr., on glaciers of New Zea- 

 land, 418. 



Habit, effect of, under domestica- 

 tion, 29. 



■, effect of, under nature, 148. 



, diversified, of same species, 



187. 



Hackel, Prof., on classification and 

 the lines of descent, 472. 



Hair and teeth, correlated, 156. 



Halitherium, 378. 



