62 Cryjlals of Nitre, 
Diffolved in Spirit of Wine, it likeWife 
produces Configurations, but very different 
from thofe in Vinegar, with Cryftals fmall- 
er than ordinary, and having little or no 
Tranfparency. 
Dr. Boerhaave fays, thefe three Species 
of Salt diffolve alike in three Times and a 
Quarter of their own Weight of Water * : 
but I have found a confiderable Difference 
in different Waters, and in different Portions 
of the fame Salt. 
CHAP. IX. 
Nitre, or Salt-Petre. 
rr^HIS Salt being diffolved in Water, 
J| a Drop of the Solution fhoots from 
its Edges, with very little Heat, into flattifh 
Figures of various Lengths, exceedingly 
tranfparent, and with Sides that are ffraight 
and parallel. Thefe are fhewn in their dif¬ 
ferent Degrees of Progreffion, at the Letters 
a, b , c, d, e, Plate I. N°. IV. where a repre- 
fents how they firfl begin. 
Many of them appear cut Hoping at the 
Ends down to a fharp Edge, in the Man¬ 
ner of a Chiffel, and are fome wider and 
others narrower. Several alfo are found 
f Shaw’s Baerb . Cbm. p. 106. Yol, I. 
with 
