6 



which the rats were moat capable of education." Kia conclusions 

 which relate particularly to the subject of this discussion are 

 as follows: 



"1. White rats of difference ages show a marked difference in 

 their activity. 



2. The very young rat and the very old rat are each notice- 

 ably inactive. 



3. These experiments indicate that the age of greatest activ- 

 ity ranges between 87 and 120 days. 



7. From these preliminary experiments no correlation can be 

 made between the age at which they are most active and the 

 age at which they learn most rapidly." 



In a later paj er he places the age of greatest activity for 



the males at ten months, and for the females at twelve and five- 



2 

 tenths months. The daily activity increases with the advance 



in age until a certain age is readied, after which there is a 



gradual reduction till death occurs^ "The female is much more 



4 

 active than the male." In this paper^ as in the earlier one, 



no attempt is made to correlate amount of activity with capac- 



1. Slonaker. J.H., The Ilormal Activity of the Albino Hat from 

 Birth to Natural Death, «bG., Journ. An. Behav. II, ('12), 

 20-42. 



2. Log. cit. , p. 30. 



3. Loc. cit. , p. 26. 



4. Loc. .cit., p. 42. 



