Time 

 Trials Absolute Total Distance 



Males 39 9.7 sec. 219 min. 296.3 m. 



Females 45 7.2 " 465 " 388.4 " 



In the matter of mean variation, the males have the lower 

 time variation, but the female distance variatioa is lower. The 

 figures are: 



Time Variation Distance Variation 



I'ales 169 sec. 171.8 m. 



Females 173 " 130.6" 



Three Hundred Day Rats. 



This group consisted of twenty-eight rats from ten fami- 

 lies, thirteen males and fifteen females, who began the jroblem 

 when three hundred days old. 



They were fed in the maze for ten days before the beginning of 



