DEPARTMENT OF EXPERIMENTAL EVOLUTION. 



Ill 



on the controls the rats showing a tendency to develop skin trouble were 

 dipped every two weeks in warm 1 per cent kreso dip No. 1. Having made 

 these allowances, the estimated weights of the two groups were plotted. 

 The average size at stated ages was found for the two groups from these 

 estimated weights. The results are given in table 3. The initial weight was 

 taken of both sets at 28 days old and then alcoholization was begun for the 

 alcoholics on the same day after the first weight-reading was taken, with the 

 exception of two individuals which were started on the forty-third day. 

 Males alone have been considered in this report. 



"The table shows that the alcoholics were about 5 grams heavier than the 

 controls before alcoholization and that they began to show a loss in weight 

 between 40 to 60 days old and continued to remain below the normal weight 

 until 243 days old. 



"The fertility of the second alcoholized generation is shown in table 4. 

 This generation, like the first, is less fertile than the normals. The average 

 size of a litter of alcoholics does not seem to be much below the norm. The 

 average number of litters, however, born to the alcohoUcs is scarcely half the 

 number born to the normals during an equal period. 



"Table 5 gives the results of the fertility record of the second generation 

 offspring (from alcoholized parents). The number of young born to the 

 offspring of alcoholics is greater than the controls; the average size of the 

 litter of the former is, however, smaller than the controls. 



"Table 6 gives the fertility record of the third generation (from alcoholized 

 grandparents). The same thing is true here as for the second generation 

 (from alcoholized parents). 



Table L — Results of training. Maze problem. 



Alcoholized rats and their normal sibs; parents of rats in experiment 15, first generation; 

 3 normal and 3 alcoholized rats. 



Experiment 15. 



Non-alcohoUzed offspring of alcoholized parents and the controls, second generation; 



6 normal and 6 alcoholic rats. 



