( 3' ) 



principal of thefe is filex, the next alumine, 

 and that which is lead of all in quantity, 

 lime. This analyfis agrees with that made 

 by Achard on fome of the pureft Bohemian 

 garnets ; and fuch a proportion of the con- 

 flituent principles is fufhciently fuitable to 

 that of the garnets of Vefuvius, in which Berg- 

 mann found about ^^ parts of filex, 39 of 

 alumine, and 6 of lime. And though the 

 proportion of the filex to the alumine is 

 not entirely the fame in both thefe ftones, 

 the difference is not fo great,, in my opinion, 

 as to induce us to confider them as two 

 diftind fpecies ; as will appear by compar- 

 ing the numbers ^^ and 39, which exprefs 

 the quantities of filex and alumine in the 

 Vefuvian garnets, with the numbers 48 and 

 30, denoting thofe of the fame two earths, 

 in the Bohemian garnets, analyzed by the 

 before-cited chemift of Berlin (Achard). 



To return for a moment to the garnets of 



Lipari: thefe do notfo tenacioufly adhere to 



their bafe as we almoft always find the felt- 



fpars and fhoerls ; but, like other garnets, are 



z mpl anted 



