116 



CARNEGIE INSTITUTION OF WASHINGTON. 



experiments. In this new set the amount of alcohol given has been 

 greatly increased and certain changes have been made in the method 

 of training; also, a new stock of rats from the Wistar Institute was made 

 use of. The treated rats were left in the alcohol-vapor every day until 

 they were in deep stupor. 



While it is not possible, as yet, to give the results of this new experi- 

 ment in relation to the main problem, certain side-topics have received 

 much light. The effect of the alcohol upon the growth of the rats 

 receiving it has been determined. Weekly weighings have been made 

 of all the alcoholized rats and their normal controls and from these 

 weights individual growth-curves have been plotted. The average 

 size at stated ages has been found. These results are given in table 1. 

 Since the females were continuously breeding, only males are included 

 in the data given. The loss in weight of the alcoholics after 6 months 

 of alcoholization amounts to more than 20 per cent of the weight of the 

 normals. 



Table 1. — Average weights, in grams, of alcoholized male rats compared with their 



normal brothers. 



Table 2. — Fecundity records of alcoholic rats compared with normal rata. 



[Mating? of the alcoholicg and the corresponding normals made on the same day, and the 

 record of births taken during equal periods.] 



