[ XVI ] 



rated boles, alum ores, and a great number of 

 faxa, which are all of a plated dru&ure, dividing 

 into leaves as thin as padeboard : And there- 

 fore I make no doubt but all kinds of ftones 

 may be found of fuch a figure in fome parts of 

 the world. What confufion would it not occa- 

 fion if all thefe different kinds were included 

 under one genus ? And are there not folid 

 ftones found coniifting of the fame condiment 

 parts as the Hates, which are feparately confi- 

 dered in fydems ? 



I could not range the ores according to the 

 different kinds of rock in which they are found ; 

 for indance, the Goofe-dung diver ore, the Liver 

 ©re, and many more of the fame kind, dnce 

 obfervations upon the matrices of ores belongs 

 to another branch of the Mineral Science, cabed 

 Geographia fubterranea> or Cofmographia Jpe- 

 cialis-y in which likewife the clefts, fiffures, 

 and veins or loads, that occur in every iort of 

 rock, (in order to promote the circulation and 

 fixation of the mineral vapours) are created of. 

 In that Science alfo the Petra Parafitica are 

 pointed out, whofe number perhaps is not yet 

 known ; as likewife the glofly fiffures from 

 which the Miner ce Specular es have obtained 

 their name. And this is a branch of fcience, 

 which, in the hands of a ikilful mineralift, is 

 likely to furnifh us with a perfeel idea of the 

 age of every fort of done, and alio of their 

 different gradations between the two accidents, 

 to which all created beings are (ubjecl:, Com-* 

 pofition and Dcftrudtion, 



Since 



