346 



INDEX 



IndividualH, many, whether simulta- 

 neoiialy created, ii. 147 



luberitance, laws of, i. 39 



, at corresponding ages, i. 39, 128 



Insects, color of, fitted for their sta- 

 tions, i. 126 



, sejiside, colors of, i. 191 



, blind, in caves, i. 197 



, luminous, i. 262 



, their resemblance to certain ob- 

 jects, i. 309 



, neuter, i. 387 



Instinct, i. 346 



, not varying simultaneously with 



structure, i. 384-385 



Instincts, domestic, i. 352 



Inlercrossing, advantages of, i. 143; 

 ii. 33 



Islands, oceanic, ii. 186 



Isolation favorable to selection, i. 151 



Japan, productions of, ii. 166 



Java, plants of, ii. 171 



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

 Bermuda, ii. 189 



Jourdain, M., on the eye-spots of star- 

 fishes, i. 251 



Jukes, Prof., on subaerial denudation, 

 ii. 59 



Jussieu, on classification, ii. 218 



Kentucky, caves of, i. 197 

 Kerguelen Land, flora of, ii. 177, 198 

 Kidney-bean, acclimatization of, i. 



202-203 

 Kidneys of birds, i. 204 

 Kirby, on tarsi deficient in beetles, L 



194 

 Knight, Andrew, on cause of varia- 

 tion, i. 31 



Kolreuter, ou intercrossing, i. 142 



, on the barberry, i. 144 



, on sterility of hybrids, ii. 9-10 



, on reciprocal crosses, ii. 20 



, on crossed varieties of nicotiana, 



ii. 44 

 , on crossing male and hermaph- 

 rodite flowers, ii. 265 



Lamarck, on adaptive characters, ii. 



227 

 Lancelet (Amphioxus), i. 179 



, eyes of, i. 253 



Landois, on the development of the 



wings of insects, i. 267-258 

 Land-shells, distribution of, ii. 195 



, of Madeira, naturalized, ii. 202 



, resisting salt water, ii. 196 



Languages, classification of, ii. 223 

 Lankester, Mr. E. Bay, on longevity, 



i. 289 



, on homologies, ii. 246 



Lapse, great, of time, ii. 57 



Larvae, ii. 250-252 



Laurel, nectar secreted by the leaves, 



i. 137 

 Lauren tian formation, iu 90 

 Laws of variation, i. 190 

 Leech, varieties of, i. 115 

 Leguminosse, nectar secreted by 



glands, i. 137-138 

 Leibnitz's attack on Newton, ii. 304 

 Lepidosiren, L 154; ii. 117 

 , limbs in a nascent condition, ii, 



267-268 

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



having changed in Egypt, i. 289 



, on the Salamandra atra, ii. 266 



, on many forms of life having 



been at first evolved, ii. 310 

 Life, struggle for, i. 100 

 Liugula, Silurian, ^. 89 



