Abstracts. 299 



The treatment of the Fi generation ranges from 130 to 354 

 days with a mean of 210.35 days, or approximately 7 months 

 in these experiments. 



THE EXPERIMENTAL MODIFICATION OF THE GERM 



CELLS. 



II. The Effect Upon the Domestic Fowl of the Daily 



Inhalatiox of Ethyl Alcohol and Certain Related 



Substances.* 



This paper, the second of the series, deals with the effect 

 of alcohol and related substances on the treated individuals. 

 Summarily stated the results of this study are : 



1 . The mortality among the treated birds w^as much smaller 

 than among their untreated control sisters. After 15 months 

 of treatment the diiterence was 41 per cent in favor of the 

 treated birds. 



2. The body weight changes in the treated birds were as 

 follows : immediatelv following the starting of treatment, which 

 was in the autumn, there was an increase in mean body weight, 

 probably in no way due to the treatment. Following this initial 

 rise, which reached its peak in January or February, there was 

 a sharp and prolonged fall in mean body weight which reached 

 its lowest point in May or June. Beginning in June or July 

 there was a steady increase in mean body weight continuing 

 without break until the end of the period covered in this report 

 (February i, 1916). At the date mentioned the treated birds 

 were on the average 9.9 per cent heavier than their untreated 

 sisters. 



3. Neither the total amount nor the distribution of egg 

 production were significantly diiJerent in the treated birds from 

 what they were in the controls. Both treated and control" birds 

 laid normally and well. Taking the whole untreated flock, the 

 mean production per bird in the 15 months was 184.74 eggs, 

 while the mean production for the treated birds was 183.97. 

 Generalizing the results we may say that the treated birds are 

 slightly superior to the untreated birds. 



*This paper is an abstract from a paper by Raj-mond Pearl, having 

 the same title and published in the Journal of Experimental Zoology, 

 Vol. 22, No. 1, pp. 165-186. 



