87 



probably had not reached their efficiency level during the 

 learning irocesi', while the other rata had. This fact ia 

 deduced from the number of times each rat male a record low. 

 er than its absolute time record. 



Rat 8 9 times out of 28 



" 12 8 



"14 21 



"15 14 



"16 2 



" 17 3 " " 



