394 INDEX. 



Glen Tilt, granite-veins at, 159. 



-, the supposed altered rocks of, 329. 



Gneiss of the Western Isles of Scotland, 67. 



traversed by granite-veins, 73. 



. of Norway, 75. 



. of the Erzgebirge, 83. 



-, transition of the, into mica-slate, 84. 



, alternations of, with granite in Norway, 76. 



, a general description of, 203. 



Granite, the ordinary composition of, 13. 



, Cornish, alternating layers of, 23. 



, beds of, in the slates of Ireland, 63. 



, in the gneiss of Norway, 76. 



and eurite alternating in Corsica, 89. 



, the^ schistose, of Arran, 93. 



and slate, the position of, at their junction, referable to their 



structure, 125. 



-. , detached masses of, in slate, 144. 



, a rock of all ages, 215. 



. , protrusions of, in a solid state, 216. 



possesses the characters of strata, 233. 



, the apparent stratification of, 242. 



[. . formation, shorlaceous, of Cornwall, 15. 



, hornblendic, of Scotland, 25. 



, micaceous, of Ireland, 28. 

 , talcose, of the Alps, 86. 



Corsica, 89. 



Granitic groups, general remarks on, 194?. 



rocks, different kinds of, 11. 



, the Cornish varieties of, 15. 



9 quartzose species of, 18. 



their relative arrangements, 20. 



- in the schistose group of Cornwall, 50. 



-, the structure of, 92. 



-, the cleavage of, 98. 



-, the strike of the beds of, 99. 



-, alternating beds of, 242. 



Granite-veins in granite, 21. 



in the schistose rocks, 148. 



Greenstone, porphyritic, of Aberdeen, 26. 



, primary, of Cornwall, 43. 



Greywacke, primary, of Ireland, 62. 

 Gueymard, M., on the geology of Corsica, 89. 



H. 



Hall, Sir James, on the position of slate next granite, 125. 

 , on slate in the granite of Galloway, 146. 



