[ 3 ii 3 
Experiment II. Take a dropof the blood of an 
animal that has large particles, as a frog, a fifit, or, 
what is ftill better, of a toad ; put this blood on a 
thin piece of glafs, as ufed in the former experi- 
ment, and add to it fome water, firfi one drop, 
then a fecond, and a third, and fo on, gradually 
increafing the quantity ; and in proportion as water 
is added, the figure of the particles will be changed 
from a flat to a fpherical fhape. When much 
water is added, the veficle will by degrees be- 
come thinner, and more tranfparent, and will at 
laft be diffolved. When the veficle has thus 
affumed a fpherical fhape, it will roll down the 
glafs flage fmoothly, without thofe phafes which 
it had when turning over whilft it was flat; and 
as it now rolls in its fpherical fhape, the folid 
middle particles can be diftinctly feen to fall from 
fide to fide in the hollow veficle like a pea in 
a bladder. Sometimes, indeed, inflead of falling 
from fide to fide, the folid middle particle is feen to 
flick to one part of the veficle ; and in proportion 
as the veficle, in head of being fiat, afiumes a fphe* 
rical fhape, its longed diameter is fhortened as might 
be expected, on the fuppofuion of its being hollow 
and flat. 
After this experiment has been made on the blood 
of fuch animals as have large vehicles, it may be made 
on human blood, where the water will be found to 
have the fame effect; the veficles will become fphe-- 
rical, the diameters of thefe fpheres will be lefs than 
the largeft diameter of the veficle was, in its fiat 
date. 
It« 
