328 



INDEX. 



Veins, general composition of, 104. 

 Veins, their formation and infiltration, 

 106. 



VEINS, THEIR NATURE AND ORIGIN, 

 101-110. 



Vital development, theories of, 302. 



Vital development, treatment of the- 

 ories, 305. 



Volcanic accumulations of current 

 epoch, 267. 



Volcanic areas of present day, 62, 64. 



Volcanic cones, various slopes of, 53. 



Volcanic products, summary of, 62. 



Volcanoes, nature and operations of, 52. 



Volcanoes, upheaval and accumulation 

 theories, 54. 



Vulcanism, cosmical functions of, 63. 



VULCANISM, ITS NATURE AND FUNC- 

 TION, 51-68. 



Vulcanism, mechanical and chemical 

 theories of, 60. 



Vulcanism, necessary portion of world 



mechanism, 63. 

 Vulcanism, vulcanicity, Humboldt's 



definition of, 61. 



"Wash-outs," probable nature of, 166. 

 WASTE AND REPRODUCTION, 35-50. 

 Water, its nature and circulation, 213. 

 Waves, geological effects of, 41. 

 Wealden formation, nature of, 189. 

 Wenham ice, how prepared, 225. 

 WHAT OF THE FUTURE? 309-322. 

 WHAT WE OWE TO OUR COAL-FIELDS, 



177-186. 



Winds, geological effects of, 39. 

 Worm-trails and burrows of the old red, 



132. 



Zamias of secondary system, 197. 



THE END. 



PRINTED BY WILLIAM BLACKWOOD AND SONS, EDINBURGH. 



