VARIETIES. 



INDEX. 



WOODWAKD. 



431 



Varieties, when crossed, fertile, 239. 



, , sterile, 241. 



, classification of, 348. 



Verbascum, sterility of, 223. 



, varieties of crossed, 241, 242. 



Verlot, M., on double stocks, 215. 

 Verneuil, M. de, on the succession of 



species, 280. 



Vibracula of the Polyzoa, 181. 

 Viola, small imperfect flowers of, 



'61. 



-- , tricolor, 53. 

 Virchow, on the structure of the 



crystalline lens, 136. 

 Virginia, pigs of, 61. 

 Volcanic islands, denudation of, 251. 

 Vulture, naked skin on head, 148. 



W. 



Wading-birds, 324. 



Wagner, Dr., on Cecidomyia, 363. 



Wagner, Moritz, on the importance 

 of isolation, 76. 



Wallace, Mr., on origin of species, 1. 



, on the limit of variation under 



domestication, 29. 



, on dimorphic lepidoptera, 33, 



217. 



, on races in the Malay Archi- 

 pelago, 34, 35. 



, on the improvement of the 



eye, 136. 



, on the walking-stick insect, 

 170. 



, on laws of geographical dis- 

 tribution, 302. 



, on the Malay Archipelago, 



330. 



, on mimetic animals, 354. 



Walsh, Mr. B. D., on phytophagic 

 forms, 36. 



, on equal variability, 117. 



Water, fresh, productions of, 322. 



Water-hen, 133. 



Waterhouse, Mr., on Australian 

 marsupials, 84. 



, on greatly developed parts 



being variable, 111. 



, on the cells of bees, 205. 



, on general affinities, 355. 



Water-ouzel, 133. 



Watson, Mr. H. C., on range of 

 varieties of British plants, 34, 43. 

 , on acclimatisation, 105. 



Watson, Mr. H. C., on flora of 

 Azores, 308. 



, on Alpine plants, 311. 



, on rarity of intermediate va- 

 rieties, 127. 



, on convergence, 94. 



, on the indefinite multiplica- 

 tion of species, 94. 



Weale, Mr., on locusts transporting 

 seeds, 307. 



Web of feet in water-birds, 134. 



Weismann, Prof., on the causes of 

 variability, 5. 



, on rudimentary organs, 375. 



West Indian Islands, mammals of, 

 330. 



Westwood, on species in large genera 

 being closely allied to others, 42. 



, on the tarsi of Engida;, 116. 



, on the antennae of hymeno- 



pterous insects, 343. 



Whales, 170. 



Wheat, varieties of, 82. 



White Mountains, flora of, 310. 



Whitaker, Mr., on lines of escarp- 

 ment, 250. 



Wichura, Max, on hybrids, 233, 234, 

 243. 



Wings, reduction of size, 101. 



of insects homologous with 



branchiae, 138. 



, rudimentary', in insects, 372. 



Wolf crossed with dog, 196. 



of Falkland Isles, 329. 



Wollaston, Mr., on varieties of in- 

 sects, 35. 



, on fossil varieties of shells in 



Madeira, 39. 



, on colours of insects on sea- 

 shore, 99. 



, on wingless beetles, 101, 102. 



, on rarity of intermediate va- 

 rieties, 127. 



, on insular insects, 326. 



, on land-shells of Madeira 



naturalised, 335. 



Wolves, varieties of, 66. 



Woodcock with earth attached to 

 leg, 308. 



Woodpecker, habits of, 132. 



, green colour of, 148. 



Woodward, Mr., on the duration of 

 specific forms, 258. 



, on Pyrgoma, 267. 



, on the continuous succession of 



genera, 274. 



