Figure 3 



This drawing, which was made from life, depicts Paramecium and Vorti- 

 cella as seen under normal living conditions, at a magnification of about 300 

 diameters. In the foreground, two Paramecia are seen swimming near a por- 

 tion of the stem and leaf of the green, water-living plant, Elodea (p. 12). 

 In the upper right a carnivorous Ciliate, Didinium, is seen attacking a Para- 

 mecium, and to left a pair of conjugating Paramecia is shown. Attached to 

 the Elodea leaf are numerous specimens of the ' bell-animalcule ' Vorticella, 

 in various stages of contraction as described in the following chapter. 



41 



