( S2 ) 



are mentioned with a degree of wonder by 

 every writer on that volcano, are certainly 

 inconfiderable indeed, with refped to their 

 extent, when compared to thefe. Yet of all 

 the fulphureous exhalations which muft 

 have fpread themfelves fo widely over the 

 illand, not one now remains in a£tion, ex- 

 cept a few very thin fumes that rife from 

 the ground near the Stoves. 



T vifited the Stoves three times : the two 

 fnft I returned to the city by the fame road I 

 went, which is hollowed in the tufa; but the 

 third I took my way back by Campo Bi- 

 anco, and the Monte della Caftagna, w^hence 

 i proceeded to the Iiigh mountain of San 

 Ahgelo. We have already feen that Campo 

 Bianco -and the Monte della Caftagna are 

 IW6 mountains formed entirely of pumices 

 and glafles, that is to fay, of vitrified fub- 

 ftances * : but how extenfive muft be the 

 roots of t^efe fubftances ! The declivity of 

 the Monte delle Btufe, and its ample plain 

 covered with tufa, form, as has been ob- 

 *SeeChap. XV. 

 ■ ■ I ferved. 



