ITALY. LETTER XVIi. 24$ 



periphery of the ancient volcano j which, in former 

 times, rofe between them, and, after having burnt 

 out, funk in the interjacent valley, and is now 

 covered all over with marl. By the following 

 accounts, it will appear that this marl ought to be 

 eonfidered as a marine fediment, and that the 

 lavas and volcanic afhes are buried under it. 



E. From Radicofani to Siena ; the road conti- 

 nues to S. Quirico over grey and blue marl-hills ; 

 which, in fome depth, were entirely blue, con- 

 fifted in lime, mixed with clay, fermenting with 

 acids and the above-mentioned blunted limeftones. 

 Near the inn dello Spedaktto I obfcrved in this 

 marl fome thin calcareous flrata, with fea-fliells, 



t. Greenilh fteatites or bacon-ftone. 



/. Calcareous earth, agaricus minerals la: lun<e. I do not 

 know exactly whether it be calcareous or felenitic. 



g. Mercurial clay, with adherent cinnabar; found in the 

 volcanic ground near Silvena nella Contea di S. Fiora, in 

 inonte S. Fiore ; the cinnabar fublimated by fubterraneous fire 

 into the furface of this high elevated ground. There appears 

 cinnabar even in the cracks and joints near the furface or the 

 day of this volcanic hill. I did not mention it in one of my 

 former letters. They {hewed me quartz-cryftallizations front 

 Silvena, pretending them to have been found in volcanic 

 productions. But I doubt it. They may have been found, 

 perhaps, .on the calcareous fide. 



h. Grey ftriated antimony in lava, from Silvena. 



z. Cinnabar-lumps, from the abbey di S. Sahadore alia 

 Mvntagna di S. Fiora, 



R a Neaf 



