. 



ITALY* LETTER XIV. l$$ 



Paleftrina over the limeftone, you meet with vol- 

 canic tufo, mixed with fmall farinaceous garnet- 

 fherls, large lumps of black lava from the adja- 

 cent volcanos, and with black and greenifh fherl- 

 mica, or lamellated fherl. Much merl-cryitals are 

 warned out by the rain. The whole country, for 

 eight or nine Italian miles, is a flat plain of volcanic 

 afhes or tufo. Some miles on this fide of Fraf- 

 cati, the road afcends to very high volcanic tufo- 

 hills, pafTes by monte Algido and monte Porcio, 

 till it brings you to Frafcati. Thefe tufo-hills 

 run afterwards in an uninterrupted chain to Ma- 

 rinoy Aibano, Genfano, Veletri, and bending be- 

 hind monti dell* Arianoj they run back to monte 

 Algido. Within this circle lay inclofed the whole 

 extent of monte Cavo or Albano, its adjacent vol- 

 canic hills, and Lago di Nemi and di Caftello. Ac- 

 cordingly the whole country is volcanic, as will 

 plainly appear hereafter. Ametis map of Latium 

 Parts i. maritima is very accurate. 



From Frafcati the road goes over Rocca di 

 Papa, a fmall place fituated on a high rock of 

 lava, and Brings you to monte Cavo or monte Al- 

 bano. There are on both fides of this hill old 

 roads paved with lava. 



Monte Albano or monte Cavo confifts of volcanic 

 productions, which are the following. 



O2 i. Grey 



