Salt of Peruvian Park . 171 
a considerable Degree of Thickiiefs, they 
appear more tranfparent than the c lea reft: 
Glafs, and would almoft evade the Sight, 
were it not for the faint Shadows caft by- 
means of that Thicknefs. 
Towards the End of the Operation the 
empty Spaces are filled up with Shootings 
from fome of the moil detached Parallelo¬ 
grams, which protrude themfelves forwards, 
dividing and fubdividing as at f and that 
lometimes to fuch a Degree of Thinnefs 
and Slendernefs as to have the Termination 
of their Extremities loft to the Eye by.rea- 
fon of their exquifite Tranfparency 5 this 
may be conceived by confidering the Fi¬ 
gure g. 
CHAP. XXXIX. 
Salt of Peruvian Bark. 
H E few Shootings which this Salt 
JL produces at the Edge of the Drop 
are of no regular Figure, but referable thofe 
at a, Plate VII. The whole Area of the 
Drop becomes quickly filled with great 
Numbers of Rhombi, of different Sizes, ex¬ 
tremely thin and tranfparent, vid. b. Some 
of thefe enlarge greatly, and acquire a con- 
fiderable Thicknefs, forming themfelves in¬ 
to Solids of many Sides, as c c. Near the 
Con- 
