42 HELEN B. HUBBERT 



The males appear to be inferior to the females as is shown 

 by comparing the averages for the two sexes: 



Time 



Trials 25 Absolute Total Distance 



Males 38 11.8 sec. 721 min. 361.3m. 



Females 37 10.1 " 466 313.9" 



COMPARISON OF RESULTS OBTAINED FOR THE 

 DIFFERENT AGES 



TABLE VII 

 GENERAL AVERAGES 

 Time 



Age Trials Absolute Total Distance Speed 



25 days: 



Males ... 32 5.7 sec. 213 min. 277.6 m. 21.6 cm. per second 



Females. 29 .5.6 232 267.8 19.2 " 



All 30 5.7 224 271.6 20.1 



65 days: 



Males... 27 7.1 " 192 228.3 19.8 



Females. 37 6.3 257 307.6 19.9 " " 



All 31 6.8 " 219 260.6 u 19.8 " u 



200 days: 



Males... 39 9.7 263 296.3 19.5 " " 



Females. 45 7.2 465 388.4 13.8 



All 42 8.6 " 351 " 339.1 16.0 " u 



300 days: 



Males... 40 11.5 " 734 344.3 " 7.8 " 



Females. 41 11.7 752 380.2 " 8.2 



All 41 11.6 " 743 367.5 8.2 " 



Table VII shows the general averages for each age as well 

 as those for the males and females separately. Averages for 

 the five hundred day rats are omitted for reasons already given. 



25 Two five hundred day rats did not finish the problem. Each had been given 

 sixty trials when the experiment had to be discontinued. The records were: 



Total time Total distance 



Rat no. 15 13046.2 sec. 58371.2 m. 



16 17400.2 " 64174.4" 



Rat number 15 had made five perfect runs in the course of his training, but had 

 never gone perfect twice in succession. 



Rat number 16 had made twelve perfect runs, and on two occasions had trav- 

 ersed the path twice in succession without error, but never succeeded in doing it 

 three times in succession. 



The time record for each rat is greatly above that of any rat shown in table VI. 

 The distance record of rat 16 is slightly above the maximum for the five hundred 

 day rats as recorded in the table, and that 9f rat 15 nearly reaches it. Had it 

 been possible to continue the experiment until both of these animals learned the 

 problem, the group averages for the five hundred day rats would have been con- 

 siderably increased. 



