IXDEX. 



423 



Helix pomatia, resisting salt water, 



331, 332. 

 Helmholtz, M., on the imperfection 



of the human eye, 153. 

 Helosciadium, 305. 

 Hemionus, striped, 121. 

 Hensen, Dr., on the eyes of Cepha- 

 lopoda, 142. 

 Herbert, W. , on struggle for existence, 



46. 



, on sterility of hybrids, 222. 



Hermaphrodites crossing, 70, 71. 

 Heron eating seed, 325. 

 Heron, Sir K., on peacocks, 65. 

 Heusinger, on white animals poisoned 



by certain plants, 9. 

 Hewitt, Mr., on sterility of first 



crosses, 233. 

 Hildebrand, Prof., on the self -sterility 



of Corydalis, 223. 

 Hilgendorf, on intermediate varieties, 



258. 



Himalaya, glaciers of, 314. 

 , plants of, 317. 

 Hippeastrum, 223. 

 Hippocampus, 177. 

 Holmeister, Prof., on the movements 



of plants, 184. 

 Holly-trees, sexes of, 68. 

 Hooker, Dr., on trees of New Zea- 

 land, 73. 

 , on acclimatisation of Himalayan 



trees, 105. 



, on flowers of umbelliferae, 108. 



, on the position of ovules, ICO. 



, on glaciers of Himalaya, 314, 



315. 



, on algae of New Zealand, 317. 



, on vegetation at the base of 



the Himalaya, 318. 

 , on plants of Tierra del Fuego, 



316. 



, on Australian plants, 317, 333. 



, on relations of flora of America, 



319. 

 , on flora of the Antarctic lands, 



320, 333. 

 , on the plants of the Galapagos, 



328, 332. 



, on glaciers of the Lebanon, 314. 



, on man not causing variability, 



57. 

 , on plants of mountains of 



Fernando Po, 316. 

 Hooks on palms, 148. 

 on seeds, on islands, 328. 



Hopkins, Mr., on denudation, 256. 



Hornbill, remarkable instinct of, 219. 



Horns, rudimentary, 376. 



Horse, fossil, in La Plata, 276. 



, proportions of, when young, 



368. 



Horses destroyed by flies in Paraguay, 

 62. 



, striped, 119. 



Horticulturists, selection applied by, 

 22. 



Huber, on cells of bees, 209. 



, P., on reason blended with 



instinct, 191. 



, on habitual nature of instincts, 

 192. 



, on slave-making ants, 202. 



, on Melipona domestica, 206. 



Hudson, Mr., on the Ground-Wood- 

 pecker of La Plata, 132. 



, on the Molothrus, 200, 201. 



Humble-bees, cells of, 206. 



Hunter, J., on secondary sexual 

 characters, 111. 



Hutton, Captain, on crossed geese, 

 224. 



Huxley, Prof., on structure of her- 

 maphrodites, 74. 



, on the affinities of the Sirenia, 



283, 284. 



, on forms connecting birds and 



reptiles, 284. 



, on homologous organs, 362. 



, on the development of aphis, 



366. 



Hybrids and mongrels compared, 242. 



Hybridism, 219. 



Hydra, structure of, 137. 



Hymenoptera, fighting, 64 . 



Hymenopterous insecte, diving, 133. 



Hyoseris, 162. 



Ibla, 110. 



Icebergs transporting seeds, 308. 



Increase, rate of, 46. 



Individuals, numbers favourable to 



selection, 74. 

 , many, whether simultaneously 



created, 302. 

 Inheritance, laws o'f, 10. 



, at corresponding ages, 10, 62. 



Insects, colour of, fitted for their 



stations, 61. 

 , sea-side, colours of, 99. 



