SOME PROBLEMS IN THE PHYSIOLOGY OF THE PROTOZOA 307 



is constantly moving inward to become changed again into endo- 

 plasm. The food particles accompany this inturning, and a filament 



Fig. 153. Reactions of Amceba verrucosa and of fluid substances. [RHUMBLER.] 

 A. Amceba verrucosa with a filament of Oscillaria. B, C. Chloroform drops with a filament 

 of shellac, a, b, c, d, e. successive stages in the rolling of a filament of Oscillaria. B, C. Similar 

 rolling of a shellac filament. 



of Oscillaria, if pulled out after being partly ingested, leaves a channel 

 in which it had lain (Fig. 153, a-g). After being drawn in, the filament 



