146 TRAVELS THROUGH 



above-mentioned raw and natural fherls in mica- 

 ceous limeftone fpar, are nothing in companion to 

 thofe in the lava; and they prove, at 'lead, that 

 Nature works the fame effects by different caufes. 

 Yea, there are fome learned men at Naples, who 

 confider even thefe fheris as volcanic productions, 

 afTerting, that the glimmer was produced as the 

 variegated lamella ted litharge in fire. 



2. If, however, you would fuppofe fuch a rich 

 flherl mine under Vefuvius, how could you fup- 

 pofe the fame under all ^he other Italian vol- 

 canos ? 



3. If thefe fherl-cryflallifations had been torn 

 off from pre-exiftent fherl-mme-rccks and thrown 

 out by fire, how could they, without melting, 

 lofing their form, and mingling with the lava, 

 refift its intenfe long-lading heat ? You know it 

 is a common quality of inerls and garnets, to 

 melt eafily and to be fcorified by candle-light ; 

 however, their crystallizations are found not only 

 in the common lavas, but even in the vitrified 

 Iceland lavas or agates, as {hall be related here- 

 after. 



4. How came the fmall white garnets in the 

 inner parts of the red pumice-ftones, which are 

 found near Pompejano and other places? If pre- 

 exifting the fcorification, which fuppofes the 

 higheft degree of fire, they would have been 

 cetlroyed. 5. If 



