INDEX 



SOS 



Ungulates, development in N. America 

 during Tertiary period, ii. 18 



United States, flora of, i. 432, 433 ; 

 spread of Darwin's views in, i. 157, 



159 



Unity of coloration, Walsh on, i. 261 



Uredo, on Hcematoxylon^ ii. 411 

 Ursus arctos, Lamont on, i. 179; U. 



maritimtis. Lamont on, i. 179 

 Urticacere, i. 106 

 Uruguay, i, 13 



d'Urville, on Canary Islands, i. 409 

 Use and disuse, i. 199 ; in plants, i. 389 

 Uses, Natural Selection and, i. 355, 356 

 Uspallata, i. 20, 22 

 Utilitarianism, Darwin on, i. 328 

 Utility and inheritance, i. 239 

 Utopian Flora, Darwin's idea of, ii. 374 

 Utricttlaria, Darwin's work on, ii. 403, 



404 ; U. stellaris, Sir E. Tennent 



on, ii. 404 



VAGINULUS, Darwin finds new species 

 of, i. 15 



Valeriana. two forms of, ii. 416 



Valleys, action of ice in formation of, 

 ii. 154, 155 ; Dana on Australian, ii. 

 227 ; Darwin on origin of, ii. 21 1 



Valparaiso, i. 17 



Van Diemen's Land, i. 41 ; flora of, in 

 relation to New Zealand, i. 405 



Vanda, ii. 306 



Vandeae, structure of ovary, ii. 307 



Vanessa, two sexual forms of, i. 356 ; 

 breeding in confinement, ii. 96; 

 colour of, ii. 67 



Vanilla, ii. 271, 313 



Variability, i. 148, 161 ; backward 

 tendency of, i. 353 ; Bentham on, 

 i. 379 ; causes of, i. 155, 198, 288, 

 289 ; De Candolle on, i. 233, 234 ; 

 dependent more on nature of organ- 

 ism than on environment, i. 377 ; 

 Huxley and Scott on, i. 220 ; im- 

 portance of subject of cause of, i. 

 392 ; Natural Selection and, i. 193 ; 

 in oaks, i. 234 ; greater in bisexual 

 than in unisexual plants, ii. 314 ; of 

 ferns "passes all bounds," ii. 381 ; 

 greater in male than female, ii. 94 ; 

 in ovaries of flowers, ii. 378 ; ten- 

 dency of genera at different periods 

 towards, ii. 231 



Variation, i. 41-6, 96, 100, 105-7, 

 171, 172, 199, 222 ; an innate prin- 

 ciple, i. 199 ; Bates on, i. 181 ; in 

 blackbirds, i. 262 ; causes of, i. 155 ; 

 centrifugal nature of, i. 199 ; checked 

 by Natural Selection, i. 208 ; climate 

 and, i. 198 ; Darwin attaches import - 



VOL. II. 



ance to useless, i, 312 ; Darwin on 

 favourable, i. 271 ; divergence of, i. 

 286 ; and external conditions, i. 198, 

 354 ; in elephants, i. 207 ; in Fucus, 

 i. 102 ; of large genera, i. 98, 107, 

 108, 379 ; laws of, i. 134 ; of mono- 

 typic and polytypic genera, i. 106 ; 

 and monstrosities, i. 147, 350 ; and 

 Natural Selection, i. 172, 269-71 ; 

 ordination and, i, 193, 194, 321 ; in 

 peaches, i. 276 ; in plants, i. 41, 102, 

 105-8, 275, 425 ; ii. 157 ; produced 

 by crossing, i. 212 ; rate of action of, 

 i. 314 ; of small genera, i. 107, 108, 

 379 ; sterility advantageous to, i. 290 ; 

 Weismann on, i. 311 ; galls as cause 

 of, ii. 425 ; and loss of dimorphism 

 in Primula and Auricula, ii. 328 ; 

 Sexual Selection and minute, ii. 62, 

 63 ; transmission to sexes, ii. 86 ; 

 Verlot on, ii. 157 ; Wallace on, ii. 

 32, 63 



Variation of Animals and Plants under 

 Domestication, i. 167, 243. 285, 363, 

 364 ; ii. 389 ; completion of, i. 277, 

 278, 283, 359; delay in publication, 

 i. 286 ; Lyell on, i. 299, 300 ; trans- 

 lation of, i. 304 ; Wallace's opinion 

 of, i. 288 ; Darwin at work on, ii., 

 156, 192, 327, 404, 405 



Varieties, accumulation of, i. 161, 191, 

 337 ; distinction between species and, 

 i. 177 ; fertility of, i. 137 ; ii. 309; 

 in insects, i. 5, 94 ; in large genera, 

 i. 402 ; of molluscs, i. 94 ; production 

 of, i. 47, 212 ; species the product of 

 long series of, i. 377 ; use of, i. 126, 

 127; Wallace on, i. 118; elimina- 

 tion by crossing, ii. 250 ; zoologists 

 neglect study of, ii. 210 



Vaucher, Plantes d'Europe, ii. 375, 278 



Vegetable Teratology, Masters', i. 148 ; 



ii- 335 

 Vegetative reproduction, Darwin on, 



i. 221 



Veitch, J., ii. 276, 302, 418 

 Velleia, fertilisation mechanism of, 



ii. 258 

 Verbascum, crossing and varieties in, 



i. 138, 218,222, 230, 231; ii. 271, 



285, 293, 309 ; Scott's work on, 



325 

 Verbenaceae, i. 107 



Verlot, on variation in flowers, ii. 157 

 Veronica, Antacrtic species of, i. 163 

 Vessels, course of, as guide to morpho- 

 logy of flowers, ii. 273-5 > 287 

 Vestiges of Creation, i. 48, 49, 85 ; 

 Huxley's review of, i. 75 ; the Origin 

 of Species and, i. 136 



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