270 



W. C. ALLEE 



ever, low efficiency is always accompanied by low positiveness. 

 Again the averages show almost as striking differences as when 

 the positiveness of the response was taken as a basis of com- 

 parison in table 4. 



The accompanying reactions to concussion indicate that a high 

 vigor of shock response may occur with either a high or low 

 rate of efficiency and vice versa. Again the averages of con- 

 cussion responses are practically identical and show no apparent 

 relation to efficiency. 



TABLE 5 



Showing the rheotactic and shock reactions accompanying high and low efficiency. 

 The data were obtained as in table 7 



' Tested only during molting period. 



