( 38 ) 



and glaiTy. The moft minute parts of thefc 

 chryfolites exhibited the fame afped: they 

 prefented when whole. 



I muft not omit to mention another dif* 

 ference of importance, which is, that the 

 chryfolites of Lipari are only a few lines i^ 

 length, whereas thofe defcribed by M. Eau- 

 jas are fometimes feveral pounds in weight, 



They agree, however, with mine in their 

 infufibility in an extremely adive fire ; for 

 thofe on which he made his experiments 

 refilled the fire of common furnaces, how- 

 ever violent and continued it might be, an4 

 could not be reduced to a ftate of fufion bu^ 

 by the aid of oxygenous gas. 



The colours of both are fcmetlmes the 

 fame. 1 fay fometimes, for M. Faujas in- 

 forms us, that feveral of his chryfolites were 

 only of one colour i a green, or topaz-yel-r 

 low. 



The traits of refemblance and difference 



between 



