ALCOHOLISM AND BEHAVIOR OF WHITE RATS 



251 



DISTANCE PER TRIAL 



FREQUENCY DlSTRIBUTIONSOr AVERAGES FOR EACH RAT 



TESTS , 



TEST AVERAGES ^ 



CONTROLS 



CONTROL AVERAGES ^ 



FIRST HALFTRAINING 



CENTIMETERS 80 1 00 120 MO 160 180 200 220 240 



RETENTION 



TRAINING AND RETENTION 



•^O 60 faO iJO 

 CENTIMETERS 



20 140 160 160 200 



J [Fig. 8 Frequency distributions of the averages for each rat for distance per 

 trial, based on six groupings of the trials. Broken lines give the tests; solid 

 lines, the controls; units on the base line are centimeters; on the vertical scale, 

 numbers of individuals; males and females in all strains are included, using the 

 'completes' and 'incompletes,' but not the 'failures.' 



