1 60 Of Animalcula in Fluids . 
Fig. 311. is called a fock, the inlide of its body is 
adorned with feveral tranfparent fpots, which appear like 
eggs. 
At the time this infufion was intended to be thrown 
away, it was thought proper to put a drop of it upon 
the objedfc-carrying glafs, and to examine it by the mi- 
crofcope, whereupon one of the moil particular of all the 
foregoing animalcula was found therein. It is a kind 
of water caterpillar, and fo fcarce, that no more than 
feven or eight could be found in many trials during 
three days. Fig. 312. Ihews three reprefentations of 
one of them; in that exhibited by A B, its body is feen 
to be compofed of feveral ringlets, that enter one into 
the other, as the animalcule contrasts itfelf it pufbes 
out of its mouth a fnout compofed of feveral pieces 
Breathed in each other, which are fliewn at A C and D. 
The extremity of this fnout appears to be perforated in 
fome pofitions as at D; it is fometimes fplit in two 
parts, at other times into three, as at A, where they form 
two or three little protuberances. At LL are feen two 
lips furnifhed with moveable hairs. In other pofitions 
not one hair can be feen. While thefe things were ob- 
feiving, a kind of horn F, was fuddenly protruded from 
its bread;: its whole length appear’d to be compofed of 
feveral furbelows of unequal thickneffes, which go one 
into another like the drawers of a pocket telefcope : at 
its tail are two very fharp points as at B E, and in fome 
particular pofitions it appears in three parts as at I. 
Infufion of the bark of a young oak. 
t 
A BOUT the twenty-fifth of December feveral lit¬ 
tle pieces of the bark taken from off a branch of 
young oaks were put into cold water, and in two hours 
after 
