602 



THE AMERICAN NATURALIST 



[Vol. LI 



TABLE VIII 

 Record of the Young of Each Line 

 Summary of Tables III to VII 



As in my former experiments none of the control young 

 died of lack of vitality. The alcohol lines show a small 

 percentage of deaths— 4 mice or six per cent, in the male 

 alcohol line, 5 mice or 6.8 per cent, in the double alcohol 

 line and 4 mice or 9.8 per cent, in the female alcohol line. 

 The second generation alcohol lines had 1 death or 4 per 

 cent, of all of their young. In the former experiments 

 ('11) the fatalities were somewhat greater— 9 young or 

 11.1 per cent, in the first generation of alcoholized mice 

 and 7 young or 12.5 per cent, in the second generation. 

 Stockard ( 16), with his guinea pigs, had a fatality of 43 

 per cent, in the male alcohol line, 52 per cent, in the female 

 alcohol line, 46 per cent, in the double alcohol line and 16 

 per cent, in the control line. 



Fecundity 



Table IX gives the average number of litters, average 

 number of young, and average number in a litter for one 

 female of the control line and one female of the male 

 alcohol lines for seven months; for one female of the 

 female alcohol line and double alcohol line for 4 months ; 

 and for the second generation alcohol line for 2| months. 



On account of the difference in the length of time the 

 different lines were carried, it i*s impossible to make a 

 direct comparison. However the greater fecundity of all 

 the alcohol lines over the control line is striking. Though 



