a: system, fee; 
knowledge by judicious experiments ; the more 
we Ihall find, what is wanted to form mineral 
fyftems, and for this reafon be apt to excufe the 
faults of thofe which have been hitherto publifhed. 
From thofe, who of themfelves are fufceptible 
of thefe fentiments, I fuffer with pleafure that 
judgment, which I am myfelf ready to pronounce 
upon this ElTay, ^ 
^ranfeat cum ceteris » 
E I N I S, 
•V 
D E S C R I P- 
