46 HELEN B. HUBBERT 



INCIDENTAL TESTS 



Although the primary object of this investigation was to 

 determine the relation of age to rapidity of habit formation, 

 several minor points of interest have been touched upon in the 

 course of the experimentation which it may be well to mention. 



EFFECT OF SEX ON RAPIDITY OF LEARNING 



The ideal way in which to test this matter would be to have 

 an equal number of males and females from each litter used, 

 and at least twenty animals of each sex used at each age. In 

 our work this was impossible, but the averages given in Table 

 IX are in no instance based on less than eleven animals, the 

 number in each case being given. 



TABLE IX 

 Time 



Age Trials Absolute Total Distance Speed 



25 days: 



11 Males 32 5.7 sec. 213 min. 277.1m. 21 . 6 cm. per sec. 



16 Females.. 29 5.6 232 " 267.8 " 19.2 " " " 



65 days: 



16 Males.... 27 7.1 192 228.3 " 19.8 " " " 



11 Females.. 37 6.3 257 307.6 " 19.9 " " " 



200 days: 



15 Males.... 39 9.7 263 296.3 " 19.5 " " " 



13 Females.. 45 7.2 465 " 388.4 13.8 " " " 



300 days: 



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



15 Females.. 41 11.7 " 752 " 380.2 " 8.2 " " " 



Gen. Av.: 



55 Males.... 35 8.2 " 351 " 286.5 " 17.2 " " " 



55 Females.. 38 7.7 " 427 " 336.0 " 15.3 " " " 



It may be seen from the table that the males are at every 

 age somewhat superior to the females in learning ability, their 

 superiority being less marked in the young and old groups (25 

 and 300 days) than in the two intermediate groups (65 and 200 

 days). The general averages for an equal number of males and 

 females show the males superior to the females in all points 

 save one, that of absolute time. They finished in fewer trials, 

 required less total time, and covered a smaller amount of dis- 



