Of Animalcule in Fluids . 127 
.oil, when the vinegar began to freeze, but when it 
thawed, they as conftantly returned to it again. 
To furnifti yourfelf with minute eels, always ready 
for the microfcope, boil a little flour and water, til!' 
it comes to the confluence of fuch pafte, as the book¬ 
binders and ihoemakers ufe; expofe it to the air in an 
open veflel, and to prevent its hardening, or becoming 
mouldy on the furface, beat it well together whenever 
you find it tends that way; after a few days it will 
turn four, and then if it be examined with attention^ 
you will find thoufands of thofe eels on the furface 
thereof. To preferve them all the year, you need only 
put a little water to them, if the pafte grows dry, or a 
fiipply of other pafte, always obferving to keep the fur- 
face in a right condition, which will be eafily done when 
it is once ftored with thefe animalcula. Their conti¬ 
nual motion will prevent any mouldinefs thereon. 
Apply them to the microfcope upon a glafs flip or 
Aider, firft putting on it a drop of water, taken up upon 
the head of a pin, for them to f\vim in, and if the pafte 
be thick, it muft be diluted with a fufficient quantity 
of water to difentangle the eels, and render them dif- 
tincftly vifible. 
They are very entertaining objedfs, but more particu¬ 
larly fo if examined by the folar microfcope, with which 
they may be magnified to an inch or more in diameter. 
The internal motion of their bowels may be very plainly 
jfeen, and their mouths open to a confiderable width. 
Of 
