EMPLOYMENT 
FOR THE 
Microscope, See. 
CHAP. i. 
Concerning the Configurations and 
Crystals of Salts and Saline 
Substances. 
S I wifh nothing more heartily 
A than the real Advancement of ufe- 
Vful Knowledge, by difeovering, as 
M far as poffible, the Operations of 
Nature in the Formation of Bodies, and 
their Effects on one another : and as the 
mod: reafonable Way of accounting for 
their Effects mud arife from a Difcovery 
and Confideration of the Figure, Size, 
Solidity, Weight, and Motion, of their 
Vol, II. B con- 
