BEHAVIOR OF STOCK AND INBRED ALBINO RATS 



275 



Figures 2, 3 and 4 give, respectively, time, distance, and error 

 records for males and females averaged together, in the short 

 maze. 



Consulting the tables for the males in the long maze, we 

 find that during the first thirty trials, time, distance, and error 

 records of the stock rats were higher than for the inbred; that 

 there were more high records for the stock than for the inbred 

 rats in all three items, especially time; and further, that the 

 stock rats acquired the habit sooner than the inbred (table 1), 

 the former requiring an average of fifty-one trials, the latter, 

 eighty. In other words, the male stock rats in the long maze 

 traveled greater distances, took a longer time for most of the 

 trials, especially the first twenty, and made on the whole more 

 errors, but acquired a perfect habit sooner than the inbred. 



The same thing does not appear to be true of the females. 

 Here the course of the inbred females is much more erratic than 

 that of the stock. The stock rats, because of persistent activity, 



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1500 



1000 



300 L 



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Figure 2. — Short maze. Distance in mm. Stock, — - 



30 



inbred . 



