INDEX. 



555 



Geographical distribution, i. 437. 



'Geological Observations,' MS. be- 

 gun, i. 56. 



' Geological Observations on Vol- 

 canic Islands ' published, i. 292 ; 

 opinions on, 292 ; second edition, 

 ii. 389. 



4 Geological Observations on South 

 America,' opinions on, i. 295. 



Geological record, imperfection of, 

 ii. 18, 54, 102, 161, 286 ; succes- 

 sion in, 158-160. 



Geological Society, Darwin wishes 

 to become a member, i. 238 ; pa- 

 pers contributed to, 250, 255, 270. 



Geological specimens secured dur- 

 ing voyage, i. 244 ; disposed of, 

 247. 



Geology, importance of, i. 52 ; of 

 St. Jago, 54; article on, in 'Ad- 

 miralty Manual,' 297; Darwin 

 on the progress of, ii. 425. 



Germany, progress of natural selec- 

 tion in, ii. 120, 150, 250. 



Germination, experiments in, 413- 

 416. 



Gilbert, J. H., letter to, ii. 514. 



Glacial period, its effect on species, 

 ii. 154 ; phenomena at Cwm Id- 

 wal, i. 49. 



Glaciers, paper on ancient, in Wales, 

 i. 272. 



Glen Roy, Darwin visits, i. 57, 260 ; 

 ' Observations' on, published, 260; 

 work criticised by D. Milne, 329. 



Gourmet Club and its members, i. 



145- 



Government aid in publication of 

 ' Zoology of Voyage of Beagle' i. 



255- 



Graham, W., letter to, i. 284. 



Gray, Asa, his papers on natural se- 

 lection and natural theology, ii. 

 131, 162-164; letters to, i. 284, 420, 



437, 446, 463, 476, 491, 510; ii. 

 J 3 39. 63, 67, 80, 90, 98, 104, 119, 

 125, 130, 137, 145, 164, 165, 169, 

 173, 175, 178, 182, 195, 235, 236, 

 256, 266, 367, 400, 434, 435, 436, 



438, 439, 445, 447, 457, 458, 464, 

 465, 467, 472, 475, 477, 479, 480, 

 482, 486, 487, 488, 489, 490, 495, 

 497, 512 ; letter to Hooker on the 

 ' Origin of Species,' 62 ; on the 

 ' Origin of Species,' 64-67 ; re- 



views the ' Fertilisation of Or- 

 chids,' 446; reviews the 'Varia- 

 tion of Animals and Plants,' 256. 



Gray, J. E., mentioned, ii. 38, 85. 



Giinther, A., letters to, ii. 302, 303. 



Gurney, E., letter to, ii. 363. 



Haast, Sir Julius von, letter to, ii. 

 190. 



Hackel, E., his views on the ' Origin 

 of Species,' ii. 201 ; Darwin's 

 friendship with, 249 ; his work for 

 natural selection in Germany, 250; 

 letters to, 251, 285, 316, 358, 402. 



Haliburton, Mrs., letters to, ii. 352, 

 353, 507. 



Harvey, W. H., criticises the ' Origin 

 of Species,' ii. 68-70, 107, 168. 



Haughton, Rev. S., criticises Dar- 

 win and Wallace's joint paper, i. 

 512. 



Henslow, J. S., his friendship with 

 Darwin, i. 44, 161 ; his character, 

 45, 157 ; letter from, 167 ; letters to, 

 164, 166, 169, 174, 178, 188, 189, 

 208, 215, 221, 235, 238, 240, 244, 

 254, 256, 258 ; ii. 13; presides at the 

 Oxford discussion on the ' Origin 

 of Species,' 114 ; his views on 

 natural selection, 120 ; his death, 

 164. 



Herbert, John Maurice, Darwin's 

 friendship with, i. 42, 140-142 ; 

 letters to, 148, 21 T, 219, 302. 



Herschel, Sir J., Darwin's opinion 

 of, i. 61 ; ii. 26 ; meets Darwin, i. 



239- 



Heterogeny, Darwin on, ii. 204. 

 Higginson, T. W., letter to, ii. 354. 

 Hildebrand, F., letters to, ii. 454, 



478, 480. 

 Hippocrates anticipates Darwin on 



pangenesis, ii. 265. 

 Holmgren, Frithiof, letter to, ii. 382. 

 Holland, Royal Society of, elects 



Darwin a member, ii. 342. 

 Holland, Sir Henry, his view of the 



4 Origin of Species,' ii. 28, 45. 

 Homoeopathy, Darwin's estimate of, 



i. 341. 

 Honors conferred on Darwin, list of, 



ii. 544-547- 

 Hooker, Sir Joseph D., Darwin's 



friendship for, i. 119; letters to, 



301, 303, 3", 313, 319. 320, 322, 



