Of Animalcut a in Fluids. 139 
It is remarkable, that extremely hot weather kills 
them, and in five or fix days they are fucceeded by- 
others. 
We have no reafon to doubt, but thefe minute animal¬ 
cules are furnilhed with eyes, for two of the fame figure 
are often feen to approach each other without touching, 
and then turning, with a prodigious fwiftnefs about their 
own center. 
Another fort is fometimes found in this infufion, whofe 
extremities are terminated by two plane furfaces, parallel 
to each other, as at fig. 238. 
An infufion of tea. 
H AVING put Into the tea-pot as much tea, and 
a lufncient quantity of boiling water, as would 
make fix large cups, on the fifteenth of July ; the tea- 
leaves which remained after the hot infufion, were put 
into a large glafs jar, filled with fpring-water, and ex- 
pofed to the open air for about ten days; after which, in 
the leaf!: drop that could be taken up, when applied to 
the microfcope, were found a fwarm 0 of exceedingly 
minute animalcules, of a round figure, moving fiowly. 
Some days after they were fewer in number, but increafed 
in fize, clearer, much more diftindh, and of an oval 
figure, as at fig. 239. the circumference of their body 
appeared black, but all the reft perfectly white and tranf- 
parent, and now fwam with a furprizing fwiftnefs. Their 
bodies were of fo delicate a confidence, as that their na¬ 
tural figure was prefervea for the fpace of two or three 
minutes after dhey were dead. 
The 
t Jobless Obferv, p. 34, 
