INDEX, 397 



Plutonic theory, a sketch of the, 212. 

 Polmear Cove, granite veins of, 150. 



Junction of granite and slate at, 126. 



Porphyry, course of, 51. 



Portsoy granite, the structure of, 353. 



Primary, the term defined, 7. 



district described, 9. 



rocks, structure of the, 91. 



, the division of the, 36. 212. 221. 



, Ly ell's view of the nature of the, 218. 



slates, an enumeration of the, 37. 



, composition of, how ascertained, 40. 

 , transitions of, into each other, 41. 



-, objections to the metamorphosis of the, 311. 



Proteolite, description of the, 40. 

 Protogine, Cornish, 16. , 



of Mont Blanc, 87. 



Pyrenees, junction of limestone and granite in the, 139. 330. 



Quartz, beautiful layers of, in mica-slate, 79. 

 Quartz-rock, brecciated, 117. 

 in granite of Scotland, 28. 



Cornwall, 18. 



Ireland, 29. 



in gneiss, 72. 



Quartzose rocks, the brecciated, 116. 



, varieties of Cornish granite, 1 8. 



schistose rocks, 47. 



Rannoch, schist in the granite at, 147. 



, granite-veins at, 159. 



Relistian, conglomerate of, 1 15. 

 Reville, the structure of granite at, 99. 

 Rocks, the diagonal arrangement of, 238. 



, the structure of, confounded with stratification, 247. 



, on the relative positions of, 287. 



, primary, the apparent dislocations of, 332. 374. 



Rosemodris, junction of granite and slate at, 128. 



S. 



Schists, Cornish, the nature of their transitions into each other, 42. 

 Schistose group of Cornwall, 36. 

 of the Western Isles, 67, 



