[ * ] 



logy, with fome alterations of his own y how- 

 ever, the principal foundation remained the 

 fame in all, or according to Bromell's method, 

 which he had publifhed in a fmall book, enti- 

 tled Indications jor the fearching for Minerals : 

 Untn Mr. Pott, a chemift by profeffion, and 

 coniequently inclined rather to believe the ef- 

 fects or his experiments, than the external ap- 

 pearances alone, proceeded farther than was 

 cuftomary before his time, in the allaying of 

 ftones by fire, and afterwards published his ac- 

 quired knowledge by the title of Lithogeognefia* 

 Prom this book the faid author received confi- 

 derable honour, becaufe the true advantage of 

 his refearches began to appear : Miners and 

 other manufacturers were by it able to deter- 

 mine the reafon of certain effects, which they 

 before either did not obferve, or wilfully con- 

 cealed, to avoid the cenfure of being ignorant, 

 if they advanced fuch things as real truths, 

 which, according 'to modern fyftems were re- 

 garded as contradictory and abfurd. Mr. Wol- 

 terfdorff, a difciple of Mr. Pott, then begun 

 immediately to form an entire mineral Jyftem, 

 founded upon chemical experiments ; but his 

 mailer did not approve of it, ftiil infilling that 

 materials were yet wanting for the purpofe; 

 and that every mineral body ought fiiil to be 

 examined and tried with the fame care that he 

 had tried and examined the mod fimple of 

 them ; to wit, the Earths and Stone?. 



Such was, according to he idea I had of if,, 

 the ftate of Mineralogy, when I, touvhed by 



the 



