VALENCIEXXES. 



INDEX. 



457 



Valenciennes, on fresh-water fish, 344. 

 Variability of mongrels aud hybrids, 



259. 

 Variation under domestication, 5. 

 — — caused by reproductive system 



being affected by conditions of 



life, 7. 



under nature, 33. 



, laws of, 106. 



, correlated, 9, 114, 159. 



Variations appear at corresponding 



ages, 10, 67. 

 ■ analogous in distinct species, 



124. 

 Varieties, natural, 32. 



, struggle between, 59. 



, domestic, extinction of, 86. 



— — , transitional, rarity of, 134. 

 , when crossed, fertile, 257. 



, when crossed, sterile, 256. 



, classification of, 371. 



Verbascum, sterility of, 238. 



■ , varieties of, crossed, 258. 



Verlot, M., on double stocks, 230. 

 Verneuil, M. de, on the succession of 



species, 299. 

 Vibracula of the Polyzoa, 193. 

 Viola, small imperfect flowers of, 173. 



, tricolor, 57. 



Virchow, on the structure of the 



crystalline lens, 145. 

 Virginia, pigs of, 66. 

 Volcanic islands, denudation of, 268. 

 Vulture, naked skin on head, 158. 



W. 



Wading-birds, 375. 



Wagner, Dr., on Cecidomyia, 387 



Wagner, Moritz, on the importance 

 of isolation, 81. 



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



* , on the limit of variation under 



domestication, 31. 



, on dimorphic lepidoptera, 36, 



232. 



■ , on races in the Malay Archi- 

 pelago, 37. 



- ' , on the improvement of the eve, 

 146. 



Wallace, Mr., on the walking-stick 

 insect, 182. 



, on laws of geographical distri- 

 bution, 322. 



, on the Malay Archipelago, 351. 



, on mimetic animals, 377. 



Walsh, Mr. B. D., on phytophagic 

 forms, 38. 



, on equable variability, 125. 



Water, fresh, productions of, 343. 



Water-hen, 143. 



Waterhouse, Mr., on Australian mar- 

 supials, 90. 



, on greatly developed parts 



being variable, 119. 



, on the cells of bees, 220. 



, on general affinities, 379. 



Water-ouzel, 142. 



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

 rieties of British plants, 37, 46. 



, on acclimatisation, 112. 



, on flora of Azores, 328. 



, on Alpine plants, 331. 



, on rarity of intermediate va- 

 rieties, 136. 



, on convergence, 100. 



, on the indefinite multiplication 



of species, 101. 



Weale, Mr., on locusts transporting 

 seed-?, 327. 



Web of feet in water-birds, 142. 



Weismann, Prof., on the causes oi 

 variability, 6. 



, on rudimentary organs, 400. 



West Indian Islands, mammals of, 

 352. 



Westwood, on species in large genera 

 being closely allied to others, 45. 



, on the tarsi of Engida?, 124. 



, on the antennae of hymeno- 



pterous insects, 366. 



Whales, 182. 



Wheat, varieties of, 88. 



White Mountains, flora of, 330. 



Whittaker, Mr., on lines of escarp- 

 ment, 267. 



Wichura, Max, on hybrids, 249 251, 

 260. 



Wings, reduction of size, 109. 



of insects homologous with 



branchia.', 148. 



, rudimentary, in insects, 397. 



Wolf crossed with dog, 210. 



■ of Falkland Isles, 351. 



