XVI 



CONTENTS. 



Table-case in Recess 6. 



PAGE 



Lavas, Ashes, simple minerals, &c, from the extinct volcanos 



of the Papal States, described by H. W. Bristol 



Tufa - - - 



Peperino •'•"'• 



Ashes - - 



Cinders - 



Pumice - 



Scoriaceous Lava 



Trachyte and other Lavas - 



Basaltic Lava 



Obsidian and basaltic Lava - 





* 



- 256 



- 257 



- 259 



- 259 



- 260 



• 260 



- 260 



• 261 



- 264 



- 265 



Minerals, volcanic sand, alumstone, clay, Travertine, Tufa, 



&c. 



266-272 



Lavas and other products of Etna, described by H. W. Bristo-w - 272 



STRATIGRAPHICAL LIST OF THE ROCK SPECIMENS 279 



*. 





J 



■ 



. 



' < ■ 



. • 



1 - 



* 



.:•*.' 



1 



