48 NATURAL HISTORY 



turning itself : sometimes its motions are slow, at others 

 rapid.'' 



The diameter of this animalcule, when full grown, is 

 about 1 -30th of an inch, and is therefore easily per- 

 ceived by unassisted vision : a magnifying power of 100 

 times is sufficient. 



It is found most abundant, during spring and sum- 

 mer, in ponds and stagnant water ; and often in the 

 same water with young lizards and frogs. Infusions of 

 hemp-seed and tremella are said to abound with them. 



Figure 22 represents a globe animalcule, magnified^ 

 with four smaller globes within it. 



