ITALY. L E T T E R XI. 1 6% 



fmall vitreous fhcrl- garnets. The antiquity of 

 Pompeja gives an idea of the high antiquity of 

 thefe volcanic eruptions. But digging under the 

 foundation of Pompeja three other different tor- 

 rents of black lava have been difcovered, which 

 are one incumbent on the other, inclofe white 

 garnets, and for that reafon appear to be of the 

 remoteft antiquity. The fame has been obferved 

 under Herculaneum and Portici. 



Herculamum is buried under blackifh or dark- 

 grey ames, affected likewife by acids, and con- 

 taining inclofed fmall pumice- ftones and fragments 

 of white marble or limeftone. They are ferrumi- 

 nated into a black tufo. The theatre alone is left 

 difcovered ; all the reft is filled up again. 



Stabia is near CafteW a Mare. This place feems 

 to have been the fmalleft of all ; therefore but a 

 part has been dug out and filled up again. The 

 mineral waters hereabout are defcribed in, Trat- 

 tato delle aque acldole che fono mlla Citta di Caftell* a 

 mare di Siab':a compofto da Ralmondo ds Mojo. In 

 Napoli, 1754. 8vo. 



I take this opportunity to tell you, that hot 

 mineral waters are very common near Vefuvius, 

 and other Italian volcanos ; but they appear 

 likewife in many unvolcanic countries, fuch a? 

 England and Hungary, where I obferved them 

 in the neighbourhood of calcareous hills. Mr. 

 M 2 Guettard 



