R H E XJ M. -i8$ 
or other, I took the fird Opportunity of ex¬ 
amining it by the Microfcope, and had the 
Pleafure then, and many Times fince, to find 
my Conjecture confirmed by undeniable De~ 
monftration. 
For this Rheum is fo faturated with Salts, 
that a Drop on a Slip of Glafs will foon 
fhoot in a very beautiful and furprifing Man¬ 
ner, either with or without Heat: but if 
heated to about the Warmth of Blood, and 
then placed under the Eye, many lucid Spots 
or rather Points will be feen riling, and in- 
creafing gradually, till their Form Ihews it- 
felf to be quadrangular, with two tranfparent 
Diagonals eroding one another, fee a and d d. 
Flute IX. Thefe Diagonals fhoot foon af¬ 
ter far beyond the Square, protruding other 
Lines, at right Angles, from their Sides ; 
(vid. c c.) which other Lines produce frill 
fmaller ones from their Sides alfo, in the Or¬ 
der of the firfr; and thus they go on to form 
Configurations, whofe Elegance of Beauty 
nothing but feeing them can give an ade¬ 
quate Idea of: tho' till the Reader can him- 
felf make the Experiment, a Reprefentation, 
of their general Figure is fliewn b b , and 
in other Places of the Drop : where great 
Numbers appear, in their feveral Gradations, 
and after their ufual Manner, filling up ai¬ 
med: the whole Space, 
The fine Branchings in a little while break 
away, but the central Squares remain like 
dd. 
