ITALY. LETTER XX. 279 



LETTER XX. 



Florence, June i, 1772. 



IO W E you ftill the defcription of my jour* 

 ney from Bologna to Florence. Having got 

 the neceflary informations, dpecially Count 

 James Crcnfted's obfervations, which, in Mr. 

 Guettard's company, he made on that road, and 

 has communicated to me, I will now difcharge 

 ray debt. 



The road from Florence to Bologna is generally 

 afcending to Monte Fraverfo and Pietra Mala \ 

 but thence iloping towards Bologna. Monte Fra* 

 verfo confifts of lava produced by an ancient vol- 

 cano. Next to Florence and Bologna are argillf 

 ceous, mivery, micaceous, or macigno and marl- 

 hills, uncovered and bare. But higher up, 

 the grey limeftone of the Apennines is fuperin* 

 cumbent on them in large beds, now and then 

 feparated by fmaller marl or clay- beds. All thefe 

 argillaceous, micaceous, and rn^irl-ftrata, on both 

 T 4 fides 



