OF THE ASBESTINE EARTH, 



Having well confidercd thcfe circumflances, 

 it is plain, 



That no fuch earth cxifts as a peculiar fimple 

 nfbcftine earth. For every one of thcfe varieties 

 contains, befides a fmall portion of iron, other 

 known principles, four of which arc primitive, as 

 the calcareous, the maf\nefian, argillaceous, and 

 filiceous; and, although the fecoiul is by no means 

 info great a proportion as the hill, yet ir Hill deter- 

 mines the character and genus. As in the Scia- 

 graphy of the Mineral Kingdom, digefted and 

 arranged according to proximate principles, the 

 genera of compounded fubftances are not defi- 

 ned by the excefs in quantity cf any one parti- 

 cular ingredient; fo, in the cafe now before us, 



certainly 



