HABIT FORMATION IN ALBINO RATS 



39 



the seventh and eighth generations except that the former 

 excelled in learning. 



The body length and body weight of the seventh generation 

 average greater than those of the eighth. The relative brain 

 weight (in reference to body length) of the seventh generation is 

 5.20% less than that of the eighth. The relative brain weight 

 (in reference to body weight) of the seventh generation is 13.93% 

 less than that of the eighth. The actual brain weight of the 

 seventh generation, however, is greater than that of the eighth. 

 The percentage of water in brain and cord of the seventh generation 

 is greater than in the eighth. 



TABLE VI 

 THE INCLINED PLANE 



DAILY LEARNING AVERAGES OF SEVENTH AND EIGHTH GENERATION INBRED RATS 



(Time in seconds) 



