Of Animalcule, in Fluids. 147 
cond, fig. 251. was fomething different from the firft, 
for its body B C was furnifhed with little globules, that 
render’d it Iefs tranfparent than the firft was, at A B 
and C D. 
Infufion of old hay. 
I N this infufion were two forts of animalcules that 
merit a particular defcription. The leaf; is feen at 
fig. 252. it was of a tranfparent white; A its head, B 
its forked tail, with which it pufhes itfelf forward ; and 
it fwims fo fteadily that no particular motion of its body 
can be difcerned. 
The fecond fort are mere extraordinary and furpri- 
fmg, as well in fize as other circumftances ; two of them 
are reprefented at fig. 253 and 254. marked A, C, D, B, 
and ACEFB; A fhews the head, B its forked tail, C 
its heart, which may be feen in a regular motion, and 
D its inteftines. It is called an aquatic caterpillar; 
there are two different colours of them, one of a tran¬ 
fparent white, the other of a pale yellow. In moving 
on the objedfc-carrying glafs, they firft fix the points B, 
and then extending their body as much as poflible, reft 
tne fore part upon another place, and draw up the hinder 
part, and then again fix the point B as before, and fa on ; 
they ado fix the points of their tail to the objedt-carrying 
gluts, and itretch out and retradt themfelves by jerks, 
and fometimes turn round about upon the point B, at 
ether times they fpring forwards with a fudden jerk, and 
fwim about for fome time. 
vv hen they reft themfelves, they commonly open their 
mouths very wide as at A, fig. 254. its lips alfo are fur- 
niftud with hairs, as exprefted in the figure, which move 
very quick j it is really fmprifing to fee how haftily they 
^ 2 fwallow 
