134 



L. B. NICE 



TABLE 5 

 Number of revolutions per week of the mice in the caffeine line 



run each week was 47 036 revolutions. 



No. 15 ran much the same as No. 13, reaching a maximum of 

 79 980 revolutions at the sixteenth week. Its minimum run was 

 22 685 at the tenth week. Its average weekly run was 48 815 

 revolutions. 



No. 16 was the most active of the caffeine line. It showed 

 great activity from the eleventh to the twentieth week and rose 



