HABIT FORMATION IN ALBINO RATS 



19 



throughout its length and never approaches the appearance of 

 perfect learning. The 7th generation relearning curve, however, 

 is slightly better than that of the 6th, being flat from the four- 

 teenth day at 5.656 seconds. But it is again necessary to call 

 attention to the fact that this was a selected group, the two 



Plate IF, 

 The 



7 Sn. ln>d 



au- fctt5.n--nH5t, 



>> Siti.tiii sii.mi 



R.Icatrmnj). 



rats failing to learn having been thrown out and not tested for 

 relearning. 



The similarity in behavior of the rats of the control series 

 containing blood of the B strain (of which the original parents 

 were purchased from a Baltimore dealer) to the behavior of the 

 inbreds has already been mentioned. The length of time re- 



