138 TRAVELS THROUGH 



kind, or on Vefuvius, or in the Ihops and maga- 

 zines of lava-fellers. I divide all thefe Vefuvian 

 volcanic productions into two clafies. The firft 

 is to contain raw pre-exiilent ftones, which have 

 been by fubterraneous forces thrown out from the 

 deepeft caverns and rocks, being produced not by 

 fire but probably by water. The fecond clafs is 

 for the lavas, and other productions of fire. Thefe 

 are to be confidered as compofitions and vitrifica- 

 tions, or fcorize of the former ftones, and other 

 vitrifying materials of the deep -, and it is unhappy, 

 that, we are deftitute of compleat collections, and 

 that the veracity of the inhabitants of thefe coun- 

 tries cannot be much depended upon \ whence it is 

 dubious, whether many Vefuvian productions in, 

 the collections and fhops be really fuch, 





 b 



Firft Clefs of Vefuvian Stones. 



- 



i. Quartz. 



<?. White, compact, in large and final ler frag- 

 ments. 



b. White, cracked, femi-pellucid ; feems to 

 have been expofed to a great fire, and to have 

 been half vitrified. In the collection of Abbate 

 Sottis. 



c. Hexagonal pellucid quartz lacaellated. Ibidem. 



4. Cornmon and 



e. A me- 



