138 L. B. NICE , 



week and then showed a rather gradual dechne in running to the 

 end of the experiment. Their last run, 57 907 revolutions, was 

 their least. Their average weekly run was 87 493 revolutions. 



The alcohol hue rose almost immediately to their maximum of 

 111 833 revolutions at the eleventh week, but after that declined 

 rapidly and ran low throughout the experiment. Their last run 

 was 37 825 revolutions and their minimum 25 011 revolutions 

 at the thirty-fourth week. Their average weekly run was 63 767 

 revolutions. 



The nicotine line reached their maximum of 110 289 revolutions 

 at the fourteenth week. They retained a fairly constant level 

 with a slight decline at the end of the experiment. Their last 

 run was 79 040 revolutions and their least, if the first two weeks 

 are left out of account, 65 625 revolutions at the twenty-ninth 

 week. Their average weekly run was 86 321 revolutions. 



The caffeine line rose slowly to their maximum of 93 932 at the 

 end of the sixteenth week, and showed a rather steady decline 

 to the end of the experiment. Their last run was 42 581 revolu- 

 tions and their minimum run, 23 415 revolutions at the thirtieth 

 week. Their average weekly run was 59 079 revolutions. 



The control and nicotine lines ran close together for a large 

 part of the experiment. The controls however reached a higher 

 maximum and reached it sooner than the nicotine mice, but after 

 the fifteenth week the nicotine line was generally slightly ahead 

 of the controls. These two lines correspond to type 1. 



The alcohol and caffeine lines ran close together, except at the 

 maximum of the former. After the thirteenth week they ran 

 entirely below the control and nicotine mice. Most of the time 

 the alcohol mice ran somewhat higher than the caffeine mice. 

 These two lines correspond to type 2. 



The alcohol mice varied more than any of the other lines. 

 The average weekly decrease from their maximum run to their 

 final run was 3360 revolutions, that of the caffeine mice 2566 

 revolutions, the controls 2566 revolutions and the nicotine mice 

 1420. The nicotine line kept a more constant level than the 

 others because both No. 11 and No. 12 were very active in the 

 latter part of the experiment. 



