Salt of ‘Tartar. 157 
of Tartar and thofe of Pearl Afhes, or any 
other of the lixivial Salts of Plants, all which 
they fuppofe to receive alike the fame Qua¬ 
lities from the Fire : but the contrary to this 
will I believe be manifeft, from an Exami¬ 
nation of the Salts I am going to fubmit to 
the Reader’s Judgment ; the Configurations 
and Cryftals whereof are fo widely difiimi- 
lar, that one can hardly conceive them to 
arife from exadlly the fame Principles in the 
Salts themfelves, or to produce exactly the 
fame Effects when applied to other Bodies. 
’Tis indeed probable that the dlential Salts 
of Plants, colledted in the Form of Cryftals, 
from the Juices of their refpedtive Plants, 
without the Help of Fire, may be different 
from the Salts of the fame Plants procured 
by Incineration, and may have different Vir¬ 
tues : but I think fuch effential Salts can. 
hardly differ more .from one another, when 
examined by the Microfcope, than the lixi- 
vious Salts of different Plants are found to 
do and confequently that thefe lixivious 
Salts muft have Virtues very different from 
one another. 
The making effential Salts being a trouble- 
fome as well as tedious Operation, and con- 
fidered only as a Matter of Curiofity, none 
of the Shops could afford me any of them ; 
and even of the lixivious Salts, the Opinion 
of their being all alike has fo much reduced 
their Number, that had it not been for the 
great 
