INDEX. 



529 



Individuals, numbers favorable to 



selection, 94. 

 , many, whether simulta- 

 neously cieated, 380. 

 Inheritance, laws of, 12. 

 - — , at corresponding ages, 12. 

 Insects, color of, fitted for their 



stations, 78. 



, sea-side, colors of, 127. 



, blind, in caves.. 131. 



' . luminous, 180. 



■ — --, their resemblance to certain 



objects, 214. 



, neuter, 272. 



Instinct, 242. 



. not varying simultaneously 



with structure, 270, 

 Instincts, domestic, 247. 

 Intercrossing, advantages of, 90, 



296. 

 Islands, oceanic, 409. 

 Isolation favorable to selection, 



96. 



Japan, productions of, 395. 



Java, plants of, 398. 



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

 Bermuda, 411. 



Jourdain, M., on the eye-spots of 

 star fishes, 171. 



Jukes, Prof., on subaerial denu- 

 dation, 316. 



Jussieu, on classification, 433. 



Kentucky, caves of, 101. 



Kerguelen-land, flora of, 403, 418. 



Kidney-bean, acclimatization of, 

 135. 



Kidneys of birds, 137.' 



Kirby, on tarsi deficient in bee- 

 tles, 129. 



Knight, Andrew, on cause of 

 variation, 6. 



Kolreuter, on intercrossing, 89. 



, on the barberry, 91. 



, on sterility of hybrids, 278, 



281. 



— , on crossed varieties of nico- 

 tiana, 305. 

 -, on crossing male and herma- 



phrodite flowers, 468. 



Kolreuter. on reciprocal crosses, 



287. 



Lamarck, on adaptive characters, 



440. 

 Lancelet, 118. 



, eyes of, 173. 



Landois, on the development of 



the wings of insects, 176. 

 Land-shells, distribution of, 416. 



, of Madeira, naturalized, 421. 



, resisting salt water, 417. 



Languages, classification of, 437. 

 Lankester, Mr. E. Ray, on Longe- 

 vity, 200. 



, on homologies, 454. 



Lapse, great, of time, 314. 



Larvge, 457, 458, 459. 



Laurel, nectar secreted by the 



leaves, 86. 

 Laurentian formation, 339. 

 Laws of variation, 126. 

 Leech, varieties of, 70. 

 Leguminosae, nectar secreted by 



glands, 86c 

 Leibnitz' attack on Newton, 496. 

 Lepidosiren, 98, 358. 

 , limbs in a nascent condition, 



470. 

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



having changed in Egypt, 200. 

 , on the Salamandra atra, 



468. 



, on many forms of life hav- 

 ing been at first evolved, 500. 



Life, struggle for, 58. 



Lingula, Silurian, 338. 



Linnaeus, aphorism of, 430. 



Lion, mane of, 82. 



, young of, striped, 457. 



Lobelia fulgens, 68, 91. 



, sterility of crosses, 281. 



Lockwood, Mr. , on the ova of the 

 Hippocampus, 224. 



Locusts transporting seeds, 386. 



Logan, Sir W., on Laurentian 

 formation, 339. 



Lowness of structure connected 

 with variabilitv, 140. 



, related to wide distribution, 



423. 



