424 



INDEX. 



Insects, blind, in caves, 102, 103. 



, luminous, 141. 



, their resemblance to certain 



objects, 169. 



, neuter, 215. 



Instinct, 191. 



, not varying simultaneously with 



structure, 214. 

 Instincts, domestic, 195. 

 Intercrossing, advantages of, 71, 235. 

 Islands, oceanic, 326. 

 Isolation favourable to selection, 76. 



J. 



Japan, productions of, 314. 



Java, plants of, 317. 



Jones, Mr. J. M., on the birds of 

 Bermuda, 327. 



Jourdain, If., on the eye-spots of 

 star-fishes, 135. 



Jukes, Prof., on subaerial denuda- 

 tion, 250. 



Jussieu, on classification, 345. 



Kentucky, cares of, 103. 



Kerguelen-land, flora of, 320, 333. 



Kidney-bean, acclimatisation of, 106. 



Kidneys of birds, 107. 



Kirby, on tarsi deficient in beetles, 

 101. 



Knight, Andrew, on cause of varia- 

 tion, 5. 



Kolreuter, on Intercrossing, 70. 



, on the barberry, 72. 



, on sterility of hybrids, 220, 



221. 



, on reciprocal crosses, 227. 



, on crossed varieties of nieo- 



tiana, 241. 



, on crossing male and herma- 

 phrodite flowers, 373. 



L. 



Lamarck, on adaptive characters, 



350. 

 Lancelot, 92. 



, eyes of, 136. 



Landois, on the development of the 



wings of insects, 139. 

 Land-shells, distribution of, 231. 



, of Madeira, naturalised, 335 



, resisting salt water, 331, 332. 



Languages, classification of, 348. 

 Lankester, Mr. E. Ray, on Longe- 

 vity, 15". 



, on homologies, 362. 



Lapse, great, of time, 249. 



Larva?, 364, 365. 



^aurel, nectar secreted by the leaves, 



67. 



Laurentian formation, 269. 

 Laws of variation, 98. 

 Leech, varieties of, 55. 

 Leguminosse, nectar , secreted by 



glands, 67. 



Leibnitz' attack on Xewton, 396. 

 Lepidosiren, 78, 284. 

 , limbs iu a nascent condition, 



374. 

 Lewes, Mr. G. H., on species not 



having changed in Egypt, 157. 



, on the Salamandra atra, 373. 



, on many forms of life having 



been at first evolved, 399. 

 Life, struggle for, 46. 

 Lingula, Silurian, 268. 

 Linnaeus, aphorism of, 342. 

 Lion, mane of, 64. 



, young of, striped, 364. 

 Lobelia fulgens, 53, 72. 



, sterility of crosses, 223. 



Lockwood, Mr., on the ova of the 



Hippocampus, 177. 

 Locusts transporting seeds, 307. 

 Logan, Sir W., on Laurentian for- 

 mation, 269. 

 Lowe, Rev. R. T., on locusts visiting 



aladeira, 307. 

 Lowness of structure connected with 



variability, 110. 



, related to wide distribution, 337. 



Lubhock, Sir J., on the nerves of 



coccus, 32. 

 , on secondary sexual characters, 



116. 

 , on a diving hymenopterous 



insect, 133. 



, on affinities, 262. 



, on metamorphoses, 363, 364. 



Lucas, Dr. P., on inheritance, 9. 

 , on resemblance of child to 



parent, 245. 

 Lund and Clausen, on fossils of 



Brazil, 291. 



Lyell, Sir C., on the struggle for 

 existence, 45. 



, on modern changes of the 



earth, 70. 



