extracted from different Kinds of Waters. 453 
with the method, 8c c. are the production of this eigh- 
teenth century; and our defendants muft have fome 
gratitude for the philofophers who found out, as well 
as for thofe who improved it. If our anceftors had 
known and tranfmitted it to us, we fhould, perhaps, at 
prefent be able to judge of one of the greateft changes 
of our globe, of a change which very nearly iaterefts 
human life. 
