INDEX. 



489 



Volumes, combining, 429; equivalent, 

 435, 438-443. 



veins of, 194, 217; supposed palaeo- 

 zoic age of, 276. 



Vose, G. L., on internal heat of the Whitney, ,T. D., orthoclase of Lake Su- 

 perior, 192. 

 Williamson on the water-type, 462, 



468. 

 468; solvent powers of, 5, 6, 35, 94, 



earth, 78 

 WATER as a chemical type, 461, 465, 



223 ; they are increased by pressure, 

 65, 204, 223; in the formation of 

 granitic rocks, 6, 33, 65, 189, 190; 

 cohesion of, diminished by salts, 10, 



Waters, action of, on soils and sedi- Woody tissues, their change to coal, 



ments, 12, 22, 27, 95, 284; chemistry 

 of, 21-23; mineral, geological rela- 

 tions of, 154 - 158. See analysis 

 of Essay XL, 93,116, 135. 



Water-lime formation, 418. 



Way, action of waters on soils, 95. 



W^ebsterite, 98. 



Whitby, Ontario, water of, 116, 142. 



White, C. A., on decomposition of crys 

 talline rocks, 250. 



White Mountain rocks, 32, 188, 217, 

 242- 244, 271-276, 282, 327; granite 



Wind-River Mountains, geology of, 262. 

 Wing, Aug., on geology of Vermont, 



265. 

 Woodward on Cambrian and Silurian, 



381. 



177, 181. 

 Wurtz, Ad., on chemical types, 460, 



468 ; on radicles, 466. 

 Wurtz, Henry, on a source of internal 



heat, 78; on gold in sea-water, 238. 



ZEOLITES, solubility of, 5; modern ori- 

 gin of some, 25, 205, 297, 298 ; asso- 

 ciation of, with orthoclase, 5, 192, 

 206 ; are hydrous feldspars, 298. 



Zinciferous minerals of New Jersey, 

 215. 



THE END. 



Cambridge : Electrotyped and Printed by Welch, Bigelow, and Company. 



