69 



XL rats have a lower record than tlie groui. average in every i,ar- 

 ticular. 



In tliree out of four cases consilored then, a high or 

 low average at one age seems to indicate whether there will be 

 a high or low average for the age or ages following: 



It appears that it is possible within limits to predict 

 the capacity for habit formation of .rats of a certain litter 

 at a given age, from the behavior of their blood relations at 

 any other age. 



TABLE ill. 



Time 

 Trials Absolute Total 



Litter 



Age 



Distance 



