TRAVELS THROUGH 



mixed with black fherl feathers and lamelles. I 

 faw here fquare columnar pieces of piperino, about 

 one palm long, which proved that even the pi- 

 perino has a natural tendency to a regular cryftal- 

 lization, or to break into regular forms of lava- 

 bafalt. g. Yellow tufo, with black pumice-ftones 

 alternating with piperino, from Viterbo to monie 

 Fiafcone. In thefc yellow tufo-hills I obferved 

 large, globular, or oval black lava-lumps, which 

 decayed or mouldered into concave or fpheric 

 fcales. Thefe boulets or nodules refemble the 

 trap-nodules in Weftgothland in Sweden, but they 

 ar.e fuperior to them in bignefs. They have been 

 lively thrown out of the volcano in glowing lumps, 

 and by fucceeding cooling got the quality to crack 

 in fpheric fcales. 



B. From Viterbo to monte Fiafcone, piperino 

 alternating with yellow tufo or afhes. Behind Vi- 

 terbo, to the left, a Zolfatara or Bulicami di Vi- 

 terbo, being a lake of hot water, which fmells 

 like he$ar fulpburis. Half-way to monte Fiafcone, 

 to. the left, a pool of fimilar but cold water -, 

 which, from continually throwing up air-bladders, 

 feems to boil. All around, and clofe to it, are 

 Java-hills, with white farinaceous garnet-like 

 fherls ; but this lava is, by fubterraneous fleams 

 of vitriolic and fulphureous acids, changed into a 

 light and red porous argillaceous itprie, entirely 



fimilar 



