INDEX. 399 



Talc-schist of Mont Blanc, 86. 



Theory, the Plutonic, as applicable to the primary rocks, 212. 



, the prevailing, a summary of the objections to, 370. 



, a proposed modification of, 381. 



Ting Tang mine, intersections of veins in the, 184. 



Towan mine, South Huel, intersection of veins in the, 187. 



Transitions between rocks, the nature of, 296. 



of granite into schists, 129. 



Trap-rocks, associations of, with strata, 273. 

 , the action of, on strata, 301. 



V. 



Veins, granitic, in the schists, 149. 

 , the nature of, 346. 



-, the various phenomena of, 160. 



, mineral and metalliferous, 163. 



, small or contemporaneous, 167. 



, large or true, 170. 



, nature of their connection with rocks, 178. 



, not straight, but curved, 180. 



, the intersections of, 82. 



, heaves of, 183. 



, throws of, 187. 



, interference of, with el vans, 189. 



, tortuous in regular rocks, 337. 



, an enquiry into the nature of, 355. 



. ", on the relative ages of, 363. 



, on the apparent movements of, 367. 



Volcanos, the phenomena of, 267. 



W. 



Weaver, Mr., on the primary rocks of Ireland, 28. 60. 112. 



structure of granite, 100. 



-, on contorted strata, 341. 



Wicka Pool, Cornwall, granite-veins at, 151. 

 Williams, Mr. John, on Huel Peever, 188. 



Z. 



Zincken, M. C., on the hornfels of the Hartz, 324. 

 Zinnwald, alternations of granite and quartz-rock at, 32. 



THE END. 



