INDEX. 393 



De la Beche, Mr., on the structure of the granite of Reville, 99. 



" trap-rocks of Pembrokeshire, 277. 



determination of the conformability of rocks, 287. 



, the remarks of, on dolomization, 305. 



-, on the primary slates and greywacke of Dartmoor, 322. 



Ding Dong mine, the lode of, curiously affected, 191. 

 Dip of the slates of Cornwall, 106. 



next granite, 123. 



Dolcoath mine, Harriett's lode in, variously circumstanced, 184. 



, the interference of veins with an elvan-course in, 190. 



Dolomite, a supposed altered limestone, 305. 

 Drontheim, the conglomerated slate of, 115. 

 Dufrenoy, M., on the junction of granite and Umestone in the Pyrenees, 



139. 330. 



Duhamel, on the alternation of straight and contorted strata, 336. 

 Duntulm, the altered strata of, next trap, 301. 



E. 



Elevations of land above the sea-level, 272. 



Elvans, courses of, in granite, 22. 



, in the schistose group of Cornwall, 50. 



-, examples of heaves of, 54. 



Enys, Mr., on the cleavage of the Penryn granite, 99. 

 Erzgebirge, the granitic rocks of, 31. 



, the primary slates of, 83. 



Euphotide of Cornwall, the varieties of, 45. 

 Eurite, Cornish, the varieties of, 17. 



, beds of, in slate, near Bodmin, 150. 



associated with granite in Ireland, 30. 



. and granite, alternations of, in Corsica, 89. 



F. 



Felspar, compact, beds of, in gneiss, 70. 



Felsparite, Cornish, description of, 17. 



Pel spathic talc-rock or protogine of Mont Blanc, 87. 



Fire, central, its supposed mode of action, 213. 



Formo, in Norway, the brecciated gneiss of, 117. 



Fox, Mr. R. W., on the lodes of Dolcoath, 184. 



Fragmentary or brecciated schists of Cornwall, 48. 



Friendship mine, the lode of, traversed by cross courses, 186. 



G. 



Galloway, dip of the slate next granite in, 125. 



, the granite of, enveloping portions of slate, 146. 



-, contorted slate next granite in, 340. 



Geyersberg, alternations of gneiss and granite at, 84. 

 Glen Tilt, junction of stratified rocks with granite at, 132. 



