478 



INDEX 



Selection, i. 127 ; ii. 86 ; power of, 

 i. 306 ; J. C. Prichard on, i. 45 ; 

 and variability, i. 353 ; Darwin on, 

 ii. 84, 85 ; Galton on, ii. 43 



Insanity, concealment of, ii. 43 



Insect Life, Howard's, i. 249 



Insectivorous plants, Darwin's work 

 on, i. 355 ; ii. 240, 369, 381, 401 



Insects, alpine, i. 262 ; Lord Avebury 

 on, i. 204, 232, 233, 331 ; Bates on, 

 i. 200 ; fossil, i. 307 ; ii. 27, 82, 83 ; 

 luminous, i. 306, 307 ; of Madeira, 

 i. 483 ; F. Mtiller on metamorphosis 

 of, i. 312 ; Sharp's book on, i. 196 ; 

 study of habits more valuable than 

 description of new species, i. 337 ; 

 wingless, i. 262 ; Wollaston on, i. 

 167 ; antiquity of stridulating organs 

 in, ii. 82, 83 ; colour and Sexual 

 Selection, ii. 96 ; H. Midler's work 

 on adaptation to fertilisation of 

 flowers, ii. 359, 383 ; metamorphosis 

 of, ii. 386 ; music as attraction to, ii. 

 68 ; observation on fertilisation of 

 flowers by, ii. 392 ; Ramsay on, ii. 

 122 ; Riley's work on, ii. 385, 386 ; 

 tropical climate and colours of, ii. 

 282 



Instinct, Darwin and, i. 472 ; in nest- 

 making, ii. 80 ; selection of varying, 

 ii. 48. 



Insular floras, i. 404, 405, 410, 411, 

 480-94; ii. 2, 3, 9-1 1 ; Hooker's 

 lecture on, i. 302, 480 ; ii. 9, 160, 



235. 352 



Insular forms, i. 172 ; in Galapagos, 

 Canaries and Madeira, i. 412 ; beaten 

 ntal forms, i. 481 



Intelligei .leaning of, ii. 214 ; 



Romanes on Animal, ii. 48, 51 ; in 

 worms, ii. 213-5 



Intercrossing, in pigeons, i. 212, 213; 

 Darwin on effects of, i. 384 ; and 

 sterility, i. 290 



Interglacial periods, Darwin on evi- 

 dence for, ii. 167, 168 



intermediate forms, i. 135, 422 ; Bates' 

 paper on, i. 177 ; S. American types 

 as, i. 12 ; crossing and frequent 

 absence of, i. 367, 36S ; extinction 

 of, i. 266 ; Falconer on existence of, 

 i. 207, 211, 227 ; as fossils, i. 374; 

 Asa Gray on, i. 429 ; Plagiaulax as 

 evidence of, i. 210; Wollaston on 

 rarity in insects, i. 430 



Introduced plants, Sonckus in New 

 Zealand as example of, i. 102 ; in 

 N. America and Australia, i. 434, 

 451 ; variability of, i. 430, 431 ; Dar- 

 win on, ii. 23 



Introductory Essay to Tasmanian Flora, 

 Hooker's, i. 446, 458 



Ipswich, British Assoc, meeting (1851), 

 i. 66 



Iquique, nitrate of soda beds at, ii. 141 



Ireland, Spanish plants in, i. 53, 54, 

 461 



Iris, flowers of, ii. 275, 381 ; nectar 

 secretion of, ii. 394 



Islands, comparison between species 

 of rising and sinking, i. 458 ; fauna 

 of, i. 242 ; introduction of plants, 

 i. 241, 452, 4S3. 487; products of, 

 i. 134 ; plants with irregular flowers 

 on, i. 494 ; ii. 2 ; subsidence of coral, 

 i. 134 ; ii. 195, 196 ; survival of 

 ancient forms in, i. 481 ; volcanic, 

 i. 134 ; comparison of age of con- 

 tinents and., ii. 231 ; former greater 

 extension of, ii. 19 



Island Life, Darwin's criticism of 

 Wallace's, ii. 22-6 



Isle of Wight, occurrence of Bee-orchis 

 in, ii. 263 



Isnardia palustris, range of, i. 431 



Isolation, Bentham underestimates im- 

 portance of, i. 380 ; Darwin's opinion 

 °f> i- 379 ; importance of, i. 268, 344 ; 

 Wagner exaggerates importance of, 

 i. 311 ; Weismann on effects of, 



ii- 95 

 Itajahy, F. Midler's narrow escape from 



flood of, ii. 363 

 Italy, flora of, i. 51 

 Ivy, difference in growth of flowering 



and creeping branches, ii. 80 



Jaeger, G., letter to, i. 355 ; on 

 pangenesis and inheritance, i. 371 



James', Sir H., discussion in Athenaum 

 on change of climate, ii. 140; map of 

 the world, ii. 235 



James Island, i. 52 ; Darwin's plants 

 from, i. 402 



Jameson, i. 79 



jamieson, W., on S. America, ii. 141 ; 

 Darwin converted to glacial theory of 

 Glen Roy after publication of paper 

 by, ii. 172, 188-193 



Janet, on Natural Selection, i. 267, 

 269, 271 



Japan, American types in, i. 489 ; 

 flora of, i. 491 ; ii. 7 ; Gray's work 

 on plants of, i. 442, 459 ; progress of, 

 i. 384 



Java, botanical relation to Africa, 

 i. 412, 415 ; Alpine plants of, ii. 9 ; 

 Wallace on, ii. 14 



Jays, Crows and, i. 171 ; repeated pair- 

 ing of, ii. 74 



