ALCOHOLISM AND BEHAVIOR OF WHITE RATS 283 



that they are not random samples of the same population is, at 

 least, greater than 1,000,000 to 1. 



2. In the first half of training the variability of the time 

 averages is greater for the tests. 



3. The test rats covered more distance than the controls, 

 especially in the period during rapid learning. This is based on 

 the same groupings of the sexes, strains, and trials as were used 

 for the time data. When the strains and sexes are put together, 

 the averages of the tests are higher than the controls for each of 

 the eighteen groups of trials. The probable errors indicate that 

 the differences are statistically significant for the following groups 

 of tj"ials : first half of training, omitting the first day, training, train- 

 ing and retention. The test of the similarity of the frequency 

 distributions of the ratios of each trial of the tests and controls 

 to the corresponding points in an assumed standard normal 

 curve indicates that the chances against these two frequency 

 distributions being random samples from the same population 

 are, at least, more than 1,000,000 to 1. 



4. There is no significant difference between the variability 

 of the distance averages of the tests and controls for any of 

 the different groupings of the trials. 



5. The speed of running (number of centimeters per second) 

 does not show any clear difference between the tests and controls. 

 Although the tests ran slower than the controls in two strains, 

 in the third the controls ran slower than the tests. This differ- 

 ence in the strains appeared consistently in all the different 

 groupings of the trials, so the alcohol treatment of the grand- 

 parents does not seem to have any consistent influence upon 

 the general rate of motor activity. 



6. The time and distance data are closely correlated; this is 

 equally true for the data from the tests and the controls; tests, 

 r = 0.95; controls, r = 0.96. 



7. The test rats made more errors than the controls. This 

 is shown by the averages based on the averages for the following 

 periods which give full significant differences : first half of training, 

 omitting the first day, training, training and retention. The 

 variability of the tests is significantly greater than the controls 



