ALCOHOLISM AND BEHAVIOR OF WHITE RATS 



267 



each strain the tests took more time and covered more distance 

 in making their trials, yet in two strains the tests' rate of motion 

 was slower than the controls, while in one it was faster. It 

 must be concluded that, whatever difference there is between 



SPEED 



CENTIMETERS PER SECOND 

 FREQUENCY DISTRI BUTIONS OF AVERAGES FOR EACH RAT 



CONTROLS 



2.0 2.5 3.0 3.5 4£) 4.5 

 CMS. PER SEC 



RETENTION 



2.0 2.5 3.0 3.5 4.0 4.5 5.0 

 CMS. PER SEC 



Fig. 13 Frequency distributions of the individual averages based on speed 

 (centimeters per second). 'Completes' are used, males and females in all strains 

 together. Units on the base lines are centimeters; the numbers given are the 

 lower limits of the classes. Units on the vertical scale are the numbers of indi- 

 viduals. Broken lines show the tests; solid lines, controls. Based on distance 

 as measured from the record sheets = about 1 /13th actual speed. 



the rats with normal and those with alcoholized grandparents, 

 it is not a matter of the general rate of their motor activity, or 

 of their hypo- vs. hyperkinetic nature. 



