[ 7^ ] 



I PASS over feveral new names, as eucfafe, dioptafe, chabajie, &c. 

 as they may poflibly denote new fpecies, which I wlfh were fettled 

 in conjundlion with Berthout or Van Buch, or fome of the 

 Wernerian School. Yet even thefe denominations we are told 

 are only provifiona/, being hereafter to be altered as analyfes may 

 require. 



I MUST here add, by way of note, that Citizen Guyton, in re- 

 viewing the firft volume of my Mineralogy, 23 Ann Chy. p. 

 105 and Tc6, has fallen into two mifiakes wliich I am perfuaded 

 his candour will prompt him to acknowledge. The firft is, in 

 ftating that my experiments on the fufibility of different flones 

 and earths were made in limeftone vefTels, whereas they were 

 in Heffian crucibles. The fecond is, in ftating the alleged in- 

 fufibility of barytic earth and lime as the refult of my experi- 

 ments, whereas I exprefsly quoted Lavoiiier, having myfelf 

 made no experiments on fuch mixtures, (See Mem. Par. 1783, p. 

 599 and 600) Other writers have frequently imputed to me 

 mifiakes of Bergman, though I exprefsly quoted him. 



