THE WORLD OF MICROSCOPIC LIFE 47 



although composed only of forms well known to 

 science, was to my uninstructed vision as new and 

 fascinating as it doubtless was to Leeuwenhoek, the 

 Columbus of this new world. 



Fig. 3. Forms of Protozoa. A, Amoeba; B, Amoeba dividing; 

 C, a flagellate, Haematococcus ; D, an infusorian, Para- 

 mcecium ; E, an infusorian cyst; F, trypanosomes ; G, a 

 foraminiferan. 



The subject of protozoology, which deals with 

 these one-celled animals, has now become one of 

 the most important branches of biology. Not the 

 least of the roles played by these organisms is that 



