502 



INDEX. 



VOLCANIC. 



ZEBRA. 



Volcanic islands, denudation of, 284. 



Wings of insects homologous with bran- 



Vulture, naked skin on head, 197. 



chiae, 191. 





, rudimentary, in insects, 451. 



W. 



Wolf crossed with dog, 214. 



of Falkland Isles, 393. 



Wading-birds, 386. 



Wollaston, Mr., on varieties of insects, 



Wallace, Mr., on origin of species, 2. 



48. 



, on law of geographical distribu- 



, on fossil varieties of land-shells 



tion, 355. 



in Madeira, 52. 



, on the Malay Archipelago, 395. 



, on colours of insects on sea-shore, 



Wasp, sting of, 202. 



132. 



Water, fresh, productions of, 383. 



, on wingless beetles, 135. 



Water-hen, 185. 



, on rarity of intermediate varie- 



Waterhouse, Mr., on Australian mar- 



ties, 176. 



supials, 116. 



, on insular insects, 389. 



, on greatly developed parts being 



, on land-shells of Madeira, natu- 



variable, 150. 



ralised, 402. 



, on the cells of bees, 225. 



Wolves, varieties of, 90. 



, on general affinities, 429. 



Woodpecker, habits of, 184. 



Water-ouzel, 185. 



, green colour of, 197. 



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



Woodward, Mr., on the duration of 



of British plants, 58. 



specific forms, 293. 



, on acclimatisation, 140. 



, on the continuous succession of 



, on flora of Azores, 363. 



genera, 316. 



, on Alpine plants, 367, 376- 



, on the succession of types, 339. 



, on rarity of intermediate varie- 



World, species changing simultaneously 



ties, 176. 



thoughout, 322. 



Weald, denudation of, 285. 



Wrens, nest of, 243. 



Web of feet in water-birds, 185. 





West Indian islands, mammals of, 395. 



Y. 



Westwood on species in large genera 



being closely allied to others, 57. 



Youatt, Mr., on selection, 31. 



on the tarsi of Engidas, 157. 



, on sub-breeds of sheep, 36. 



on the antennas of hymenopterous 



, on rudimentary horns in young 



insects, 416. 



cattle, 454. 



Whales, fossil, 303. 





Wheat, varieties of, 113. 



Z. 



White Mountains, flora of, 365. 



Wings, reduction of size, 134. 



Zebra, stripes on, 163. 



THE END. 



LONDON : PKQilED BT W. CLOWES AND SONS, STAMFORD SIEEET, 

 AND CHAIiiNG CEOSS. 



