1 86 MAN, THE ANIMAL 



Cole also made tests with colors and sound. 

 One table will adequately illustrate the method. 

 High tone was used as a signal for food and low 

 tone a signal for no-food. 



High-tone, a signal for food. 



Number of trials right wrong 



I- 50 37 13 



51-100 44 6 



101-130 27 3 



Low-tone, signal for no-food. 



I- 50 34 16 



51-100 38 12 



IOI-I5O 48 2 



151-200 50 O 



Several volumes might be devoted to a detailed 

 description of similar experiments. The prin- 

 ciple is the same whether the animal is unicellular 

 or multicellular; whether it possesses an organized 

 nervous system, one that is diffused or none at 

 all. In all instances the sole criterion upon which 

 it is judged is the way the animals move. 



Each of the animals cited above had acquired 

 certain habits that were modified by the experi- 

 ment or entirely new ones were learned. The 

 earthworm is a nocturnal animal that retires under 

 a stone or into its burrow during the day-time. 



