59 



observation on the average speed for each groui during the en- 

 tire jieriod of formation of the maze habit. 



TABLL VIII 

 jpeed - (cm. per sec) 



Age l3t Trial 2nd Trial 10th Trial 2 preced- Last 



ing last 3ix 

 six 



IHCIDEIITAIi TESTS. 



Although the primary object of this investigation was to 

 determine the relation of age to rapidity of habit formation, 

 several minor points of interest have been touched upon in the 

 course of the experimentation which it may be well to mention. 



Effect of Sex on Rapidity of Learning . 



The ideal way in which to test this matter would be to 

 have an equal number of males and females from each litter 

 used, and at least twenty animals of each sex used at each age. 

 In our vork this was impossible, but the averages given in 

 Table IX are in no instance based on less than eleven animals. 



