Component 'Particles of Salts. 23 
Shape from the Particles of every other Kind 
than the Crystals they compofe do. 
The Particles of them all are indeed fo 
exquifitely minute, that no human Eye or 
Instrument can poflibly difcern them, be¬ 
ing finer, in feveral Kinds, even than the 
Particles of Air, forcing their Way through 
Metals, Glafs, and other Bodies, where 
the Air can find no Entrance. Conjectures 
have notwithstanding been made concern¬ 
ing their Figures ; fome fuppofing them 
exaCtly of the fame Shape in little, as the 
Cryftals they constitute by their Combi¬ 
nation are in a larger Size $ whilst others 
infill, that their Shape is intirely different 
from what appears in the Crystals; the 
Figures whereof arife, as they imagine, 
from a Stronger Attraction on fome Sides 
of the fame Particles than on others, 
whereby the Concretions on thofe more 
attractive Sides are greater : for, fay they, 
if the Particles of Salt that fwim in a Fluid 
attraCt each other mutually, and by their 
Figure have a greater attractive Power 
in fome Parts than in others, and if fheir 
ContaCt be greatefl in thofe Parts, fuch 
Particles will form themfelves into Bodies 
with given Figures, or, in other Words, 
will constitute regular Cryftals. 
That ingenious mathematical PfofefTor 
and Phyfician of Bononia *, Dommicus 
* Vid. Difcorfo fcpra le Figure de y Sais\ Printed at 
Bologna, p 0 . 1688. 
C a. Guild - 
