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angles. It is evident, therefore, that this 

 lava has been broken by fome violent agent ; 

 and its pieces afterv^^ards have been taken 

 up, and inclofed v^ithin the ftony fubftance, 

 which, when carefully examined, is found 

 to be only, a conglutination of very fine 

 dull of the fame pitch- flone ; which al fo 

 contains ftones of feveral other kinds. 



At Cataio, where is the villa of the Marr 

 chefe degli Obizzi, are large excavations in 

 the fide of a mountain, made in the fame 

 brecciated pitch-ftone. We here, likewife, 

 find only very fmall, but numerous, frag- 

 ments of this ftone bound together, in like 

 manner, by a congenerous ground. 



In another part of this mountain the 

 fame flone again appears ; it does nor, how- 

 ever, refemble a breccia, but forms thin 

 veins, and is extremely fimilar to that of 

 Bajamonte. 



The experiments which I made in the 

 furnace on the firft fpecies of lava I repeated 



• on 



