XV111 TABLE OF CONTENTS. 



Dana's teachings as to pseudomorphism 319 



He affirms the doctrine of epigenic metamorphism .... 320 



The old doctrine of diagenesis explained and defended .... 321 



The views of Naumann examined ........ 322 



Various illustrations of the doctrine of transmutation .... 324 



King and Rowney on the supposed transformations of serpentine . 325 



Genth on the supposed alterations of corundum 326 



Dana and Emmons on the Taconic rocks 326 



On the relations of the pre-Cambrian schists 327 



XIV. 



THE GEOLOGY OF THE ALPS. 



The researches of Alphonse Favre 328 



The crystalline rocks of Mont Blanc 329 



The uncrystalline rocks around it 331 



Association of carboniferous and liassic fossils 332 



Difficulties presented by folded and inverted strata 334 



Sismonda on the anthracitic system of the Alps 334 



Section presented by the Mont Cenis Tunnel . . . . . .335 



Age of the crystalline schists with anhydrites ..... 336 



Examples of inverted strata in the Alps 337 



On the supposed recent age of the crystalline schists .... 338 



The recomposed crystalline rocks of the Alps ...... 339 



The true crystalline schists of great antiquity 341 



Little or no evidence of metamorphism in the Alps 342 



The fan-like structure of the Alps explained ....*. 343 



Grand section across Chamonix and Mont Blanc 343 



Geological history of Mont Blanc 344 



APPENDIX. 



Antiquity of the crystalline schists of Mont Cenis 347 



Favre on the origin of crystalline schists 347 



De Beaumont and Fillet on the rocks of Mont Cenis Tunnel . . .348 



XV. 



HISTORY OF THE NAMES CAMBRIAN AND SILURIAN IN GEOLOGY. 

 PART!. SILURIAN AND UPPER CAMBRIAN IN GREAT BRITAIN. 



The Gray wacke formation of the older geologists 350 



Early studies of Sedgwick in North Wales 



Early researches of Murchison in Wales 



Cambrian as first defined by Sedgwick 352 



Silurian as first defined by Murchison 853 



Examination of the Berwyns by Murchison and Sedgwick . . . 354 



Identity of Cambrian and Lower Silurian fossils 355 



