128 



NENOZO UTSURIKAWA 

 Inbred 



Average of both responses to intermittent and continuous stimulations = 18.0 



Average of both responses to intermittent and continuous stimulations = 18.2 



(1) For inbred rats, the restlessness or continuity of response 

 is greater in case of momentary and repeated auditory stimula- 

 tion, whereas for outbred rats, the reverse is true. 



(2) The amount of restlessness varies more widely for out- 

 bred than for inbred rats. 



(3) The females of both strains show higher records for rest- 

 lessness than do the males. 



(4) The records for the females are also more variable than 

 for the males, with averages as follows: Outbred males, 17.5; 



