5 62 



INDEX OF SUBJECTS. 



Trachyte, 255, 261 

 Transitional formations, 58 

 Triassic system, 459 et seq. 

 Trilobites, 406 

 Tufa, calcareous. 243 

 Tyrol, 269, 464 'et seq. 



U 



Uniformity of natural agencies, 72, 



192 

 Upheaval, secular movements of, 



285 



V 



Valleys, formation of, 208 et seq. 

 Vein-deposits, 60, 82 

 Vertebrates, fossil, 409 et seq. 



Vesuvius, ro, 45, 96, 100, 266 



Vienna basin, 531 



Volcanoes, early theories regarding, 



9; later theories, 44, 52/66, 70, 



96, 193, 254 et seq., 317 



W 



Water, geological action of, 200; 



chemical action of, 202 ; chemical 



deposits in, 217 

 Weathering, 202 

 Wealden formation, 516 

 Wind, action of, 198 

 Worms, fossil, 396 



Yellowstone Park, 274 



THE END, 



PRINTED BY WALTER SCOTT, NEWCASTLE-ON-TYNE. 



