AMEBOID MOVEMENT 7 



entirely new angle. Certain phases of Rhumbler's theory are de- 

 veloped and elaborated by Hyman ('17) who agrees in general 

 with Rhumbler's conclusions. 



In a series of papers on feeding and other reactions of ameba, 

 Schaeffer ('12, '16, '17) concluded that Rhumbler's general state- 

 ment, wherein he says that changes in behavior are directly de- 

 ducible from the action of stimuli in effecting liquefaction or 

 gelation of the ectoplasm, does not hold in many cases of feeding, 

 and that the mechanism controlling locomotion and feeding is not 

 external, as maintained by Rhumbler, but internal. 



