204 

 may be sunned up hb fol.Towp: On the averj-it^e, the strain of 

 inbred rate having an inferior bi-nin weight did lenu v/ell in 

 Icarnin;^ to form habits than did the nornal control neriep. 

 From these results tVie followine; may be fornulnted: Deteriora- 

 tion in brain weight in a strain of rats is ucconpanied oy 

 deterioration in the ability to form nabitB. 



