224 



ZOOLOGY 



Of all the Infusoria, none is more abundant than Para- 

 mecium. It occurs everywhere, principally in stagnant 

 fresh water, but also in salt water. It lives entirely on 

 vegetable food, and is sure to abound wherever plant 

 matter is undergoing decay. When a culture is once 



FIG. 207. Carchesium, a stalked Vorticella. Greatly magnified. 



photograph of the living animals. 



From a 



started from a hay infusion, which takes one or two 

 weeks, it will be found to thrive especially on corn-meal. 

 As an example of the Heterotricha, Stentor, 1 the trumpet- 

 animalcule, may be mentioned. Stentor is found attached 

 to vegetable debris sticks, stones, water-weeds, and other 

 objects occurring in pools, ponds, lakes, and sluggish 

 streams. These things should be gathered and placed in 



1 ST<?I>TO>/>, a Greek at Troy, known for his loud voice. 



