70 



K. S. LASHLEY 



the problems presented to the animals so that a greater number 



may be trained. If the evidence given above can be verified 



by more extensive data this solution will doubtless prove to be 



the most satisfactory. 



TABLE 1 



The average number of trials required by differentially treated groups before 

 reaching the standards described in the text. The number of animals from which 

 the averages were taken is given at the left and the relative rating of the groups by 

 the two standards on the right. 



TABLE 2 

 Differences between groups c and d as measured by the two criteria of learning 



