Helix pomatia, 353. Helmholtz, M., on the imperfection Hensen, Dr., on the eyes of Cepha- Herbert, W., on struggle for exist- on sterility of hybrids, 238. Hermaphrodites crossing, 76. poi- Hildebrand, Prof., on the self-ste- Himalaya, glaciers of, 335. -, plants of, 337. Hippeastrum, 238. Hofmeister, Prof., on the movements Hooker, Dr., on trees of New Zea- on acclimatisation of Hima- -, on flowers of umbelliferæ, 116. on vegetation at the base of 259. on Australian plants, 337, 355. Hybridism, 235. Hydra, structure of, 147. Hymenoptera, fighting, 69. Hymenopterous insect, diving, 142. Kentucky, caves of, 111. Kirby, on tarsi deficient in beetles, Knight, Andrew, on cause of varia- Kölreuter, on Intercrossing, 76. -, on sterility of hybrids, 237. on crossed varieties of nico- on crossing male and herma- L. Lamarck, on adaptive characters, Lancelet, 99. —, eyes of, 145. Landois, on the development of the of Madeira, naturalised, 357. 169. -, on homologies, 385. Lapse, great, of time, 266. Laurel, nectar secreted by the leaves, Laurentian formation, 287. Leguminosæ, nectar secreted Leibnitz' attack on Newton, 421. by limbs in a nascent condition, Lewes, Mr. G. H., on species not hav- -, on the Salamandra atra, 397. -, young of, striped, 388. sterility of crosses, 238. Locusts transporting seeds, 327. Lowe, Rev. R. J., on locusts visiting Lowness of structure connected with related to wide distribution, 359. on secondary sexual characters, on a diving hymenopterous on affinities, 280. on metamorphoses, 386, 389. Lucas, Dr. P., on resemblance of child to parent, 261. Lund and Clausen, on fossils of Lyell, Sir C., on the struggle for on modern changes of the on terrestial animals not having on strata beneath Silurian on the imperfection of the on the appearance of species, on Barrande's colonies, 291. on tertiary formations of on parallelism of tertiary for- on transport of seeds by ice- on great alternations of cli- on the distribution of fresh- on land-shells of Madeira, 357. rays, 150. Matthiola, reciprocal crosses of, 244. Means of dispersal, 323. Mellipona domestica, 220. Merrell, Dr., on the American cuckoo, Metamorphism of oldest rocks, 287. acclimatisation of, 113. Miller, Prof., on the cells of bees, Mirabilis, crosses of, 243. Mistletoe, complex relations of, 2. 151. on the eyes of cephalopods, various objections to Natural -, on abrupt modifications, 201. Modification of species not abrupt, Moles, blind, 110. Molothrus, habits of, 215. Mongrels, fertility and sterility of. 255. and hybrids compared, 259 Mons, Van, on the origin of fruit |