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CARNEGIE INSTITUTION OF WASHINGTON. 



rats with their normal controls. In this case there appeared clearly a differ- 

 ence between the two sets of rats. The test animals (from alcoholized grand- 

 parents) were inferior to the controls by various criteria. We are able to 

 present, at this time, similar preliminary summaries of 36 more rats from like 

 experiments — 18 test rats from alcohohzed grandparents and normal parents, 

 18 controls from normal grandparents and normal parents. 



"Two tables, giving the results from the training on the maze and the 

 multiple-choice apparatus respectively are given. It must be noted that these 

 figures are subject to correction upon subsequent checking. The numbers 

 in the body of the tables are the averages of all the individuals in one family. 

 In each case the number of rats included in the average is shown. By an 

 experiment is meant a litter of test rats and the corresponding control litter. 

 The averages of 'all experiments' are the primary averages of the individuals' 

 averages in all experiments. 



"Table 1, the results of the training on the multiple-choice apparatus, gives 

 the comparative averages of the test and control litters under five different 

 experimental situations as indicated in the first column. The averages for 



Table 1. — Comparison of rats from alcoholized grandparents with normal controls, 

 of results of training on nmltiple-choice apparatus. 



Summary 



