130 A NURSERY FOR THE MICROSCOPE. 



the infusorians on which these rotifers feed, have their 

 stalked and free conditions, as in Vorticella, Epistylis, 



Epitfyhs, showing stalked individuals at a to d, and free individuals 

 at/and^; h, individuals showing cilia. 



&c. The latter often grows so thickly on water fleas 

 and cyclops, as actually to impede their movements in 



