508 



INDEX. 



Upper freshwater series of the Isle 

 of Wight, 368 ; marine series, 368. 

 Upper Silurian rocks, 457. 

 Urda, 264. 

 Ursus, 338. 



V. 



VALLEYS, formation of (illustration), 

 154, 155; of foundation, 154; of 

 dislocation, 153; of elevation, 154; 

 of undulation, 154. 



Vallisneri disputes the universality 

 of the deluge, 32. 



Valvata, 399. 



Vanessa, the insect, gives rise to 

 the fancy of showers of blood, 52. 



Varieties of texture of rocks, 157. 



Vegetation of the coal period (illus- 

 trations), 172; of the oolitic 

 period, 173, 441. 



Veins of granite and other igneous 

 rocks (illustrations), 143,462,464; 

 mineral, 129. 



Ventriculite, silicified (figure), 214. 



Ventriculites, 215. 



Vertebrata, 270; divisions, 272. 



Vertical columns (illustrations), 145. 



Vertical strata (illustrations), 139. 



Vinci, Leonardo da, on fossils, 28. 



Virgin forest in the island of 

 Gouahan (illustration), 441, 443. 



Volcanic rocks, 124. 



Volcano, causes of, 125. 



Volcanos, dormant, of Central France, 

 372. 



Volkmannia, 196. 



Voltzia,193, 429. 



Vulture, fossil, 309. 



W. 



WALES, coal-fields of, 436, 440. 

 Watt, Geoffrey, his experiments on 

 the formation of basalt, 124. 



Wealden group, a freshwater deposit, 

 392- ; Dr. Mantell's sub-divisions, 

 393 ; geographical distribution, 

 395 ; the Portland dirt-bed, 397 ; 

 organic remains, 402 ; the hylaeo- 

 saurus, 406 ; denudation of the 

 wealden, 407. 



Wenlock formation, 456. 



Werner, summary of his system, 36 ; 

 his followers termed Neptunists, 

 36 ; limited basis of his system, 36. 



Whales, fossil, 317. 



Wight, Isle of, basin, 362, 365, 368 ; 

 upper marine series, 368 ; upper 

 freshwater series, wealden strata, 

 400 ; geological sections, 348, 367, 

 381, 395, 401. 



Woodward, Dr., bequeaths his col- 

 lection, and founds a professorship 

 of geology, 35. 



^ X. 



XANTHUS the Lydian, his explana- 

 tion of the occurrence of fossil 

 shells, 19. 



Xenophanes, correctness of 

 geological speculations, 19. 



Xenurus, 334. 



Xiphosura, 260. 



his 



Z. 



ZAMIA, 192. 



Zechstein, or magnesian limestone, 



431. 



Zeuglodon, 318. 

 Zeugophyllum, 194. 

 Ziphius, 317. 

 Ziphodon, 326. 

 Zoo-corallina, 218. 

 Zostera, 399. 

 Zosterites, 193. 



