i 18 Salt of 'Tin, 
This cubic Salt being difiblved in Water, 
and a Drop of the Solution placed under. 
Tbe Microfcope, in the Manner before di- 
redted, produces fuch an Appearance at 
the Edges of the Drop as a a reprefent, 
coniifting of Odtaedra, partly tranfparent, 
Handing on long Necks, at frnall Diftances 
from each other, with angular Shoots be¬ 
tween them. At the fame time folid and 
regular opake Cubes will be feen forming 
themfelves in other Parts of the Drop, vid, 
b b. Plate IV. 
Thefe may be difcerned when their mag¬ 
nified Size is extremely frnall; and their 
Bulk increafes under the Eye, continually, 
till the Water is nearly evaporated. 
In the Midft of the fame Drop, and in 
feveral Places thereof, very different Figures 
will be likewife formed $ particularly great 
Numbers of fiat, thin, tranfparent, hexan- 
gular Bodies, c c c ; fome amongfl which 
are thicker, as e; and a few appear more 
folid, and with fix fioping Sides, rifing to" 
a Point as if cut and polifhed, vid. d. 
The Figure f is compofed of two high, 
Pyramids united at their Bafe *. Some, in 
this kind of Form, are found truncated at 
one of their Ends, and others at both; 
* Dr. Woodward in his Hijl. of Fojfih, Vo!. I. p. 222, fays. 
That Grains of Tin, and the Cryftals from it, in the Mines, 
are quadrilateral Pyramids: and this feveral of them now 
before me prove* 
but 
