HELIX. 



INDEX. 



INDIVIDUALS. 



449 



Helix pomatia, 353. 



Helmholtz, M., on the imperfection 

 of the human eye, 163. 



Helosciadium, 325. 



Hemionus, striped, 128. 



Hensen, Dr., on the eyes of Cepha- 

 lopods, 152. 



Herbert, W., on struggle for exist- 

 ence, 49. 



, on sterility of hybrids, 238. 



Hector, Dr., on glaciers of New Zea- 

 land, 335. 



Hermaphrodites crossing, 76. 



Helix, resisting salt water, 353. 



Heron eating seed, 346. 



Heron, Sir R., on peacocks, 70. 



Heusinger, on white animals poi- 

 soned by certain plants, 9. 



Hewitt, Mr., on sterility of first 

 crosses, 249. 



Hildebrand, Prof., on the self-ste- 

 rility of Corydalis, 238. 



Hilgendorf, on intermediate varie- 

 ties, 275. 



Himalaya, glaciers of, 335. 



, plants of, 337. 



Hippeastrum, 238. 



Hippocampus, 189. 



Hofmeister, Prof., on the movements 

 of plants, 197. 



Holly-trees, sexes of, 73. 



Hooker, Dr., on trees of New Zea- 

 land, 78. 



■ , on acclimatisation of Hima- 

 layan trees, 112. 



on flowers of umbelliferse, 116. 



, on the position of ovules, 172. 



■ , on glaciers of Himalaya, 335. 



, on algae of New Zealand, 338. 



, on vegetation at the base of 



the Himalaya, 338. 

 -, on plants of Tierra del Fuego, 



336. 



, on Australian plants, 337, 355. 



■ , on relations of flora of Ame- 

 rica, 340. 



— — , on flora of the Antarctic lands. 

 341, 354. 



* , on the plants of the Gala- 

 pagos, 349, 354. 



' , on glaciers of the Lebanon, 



335. 



, on man not causing variability, 



62. 



Hooker, Dr., on plants of mountains 

 of Fernando Po, 337. 



Hooks on palms, 158. 



on seeds, on islands, 349. 



Hopkins, Mr., on denudation, 274. 



Hornbill, remarkable instinct of, 

 234. 



Horns, rudimentary, 400. 



Horse, fossil, in La Plata, 294. 



, proportions of, when young, 



392. 



Horses destroyed by flies in Para- 

 guay, 56. 



, striped, 128. 



Horticulturists, selection applied by, 

 23. 



Huber, on cells of bees, 224. 



, P., on reason blended with, 



instinct, 205. 

 -, on habitual nature of instincts, 



206. 



, on slave-making ants, 216. 



, on Melipona domestica, 220. 



Hudson, Mr., on the Ground-Wood- 

 pecker of La Plata, 142. 



, on the Molothrus, 215. 



Humble-bees, cells, of, 221. 



Hunter, J., on secondary sexual 

 characters, 119. 



Hutton, Captain, on crossed geese, 

 240. 



Huxley, Prof., on structure of her- 

 maphrodites, 79. 



, on the affinities of the Sirenia, 



302. 



— , on forms connecting birds and 

 reptiles, 302. 



— , on homologous organs, 386. 

 -, on the development of aphis, 



390. 

 Hybrids and mongrels compared, 



259. 

 Hybridism, 235. 

 Hydra, structure of, 147. 

 Hymenoptera, fighting, 69. 

 Hymenopterous insect, diving, 142. 

 Hyoseris, 173. 



I. 



Ibla, 118. 



Icebergs transporting seeds, 329. 

 Increase, rate of, 50. 

 Individuals, numbers favourable t© 

 selection, 80. 



2g 



