{ 3^6 ) 



carbonates, fteatites, arenaclous ftonCvSJ, 

 and of a fpecies of quartzofe, micaceous* 

 fchiftus, on which, in a great meafure, 

 they reft. It is not, however, improbable 

 that this order of rocks, unaffected by the 

 iire, lies buried under the great body of the 

 Apennines. 



I made no excurfions to the Vicentine 

 mountains, which we know to be at once 

 of a volcanic and marine origin. We 

 have, likewife, no accurate lithology 6f 

 that interefting country. But from fome 

 fpecimens uhich I received from fome 

 friends, and, among others, from Signor 

 Giovanni Arduino, and efpecially from 

 the ccnverfations I had with him on the 

 fubjedl at Venice ; I clearly underftand 

 that the lavas found there have rock for 

 their bafe ; which rock is fometimes a 

 petrofilex, and fometimes a horn-ftone ; the 

 extraneous bodies contained within them 

 are fhoerls, felrfpars, and micas. Sometimes 

 fhe volcanic rock is granitous. 



I fllQuld 



