58 AN INTRODUCTION TO ZOOLOGY 



In this instance a large animal showed decided persistence in its 

 endeavors to engulf a smaller Ameba; several times it reversed 

 its course and continued the pursuit. 



A review of the facts thus far obtained seems to show that 

 factors are present in the behavior of Ameba " comparable to the 

 habits, reflexes, and automatic activities of higher organisms " 

 (39, p. 234), and " if Amoeba were a large animal, so as to come 

 within the everyday experience of human beings, its behavior 

 would at once call forth the attribution to it of states of pleasure 

 and pain, of hunger, desire, and the like, on precisely the same 

 basis as we attribute these things to the dog" (41, p. 336). 



