52 HELEN B. HUBBERT 



age except for the absolute time. The GJ rats twenty-five 

 days old had trial and distance records higher than those of the 

 entire group while their absolute and total times were less. The 

 same holds true for the GJ rats at sixty-five days except that 

 their absolute time is higher. AL rats show records lower than 

 the group averages in every case at twenty-five days but at 

 sixty-five days all of the AL averages are higher than that for 

 the group. 



Rats from the XL litter which worked at twenty-five days 

 made lower records than the average except in absolute time. 

 The same is true of the sixty-five day members of the same 

 litter and the two hundred day XL rats have a lower record 

 than the group average in every particular. 



In three out of four cases considered then, a high or low 

 average at one age seems to point to the fact that 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. 



Retention 



A retention test was made on five individuals of the sixty-five 

 day group who were caused to relearn the problem after ninety 

 days. During this time they were fed daily in the maze except 



