No. 610] ALCOHOL AND WHITE MICE 603 



TABLE IX 

 Fecundity of the Different Lines 

 Average of One Female of Each Line 



the control mice were carried longer than any line except 

 the male alcohol line, they have next to the lowest num- 

 ber of litters— the lowest being the second generation 

 alcohol line carried only one third as long as they. They 

 have the fewest young of all the lines and the smallest 

 litters. The male alcohol line can be compared directly 

 with the control line since they were both carried seven 

 months. They have somewhat larger litters, somewhat 

 greater average number of litters and nearly twice as 

 many young as the controls. It is not possible to compare 

 them directly with the lines that were only carried four 

 months, but since the averages of these lines are almost as 

 high as those of the male alcohol mice, it follows that the 

 male alcohol mice were not as fecund as the female alcohol 

 and double alcohol lines. The female alcohol mice show 

 the greatest fecundity of all the lines, while the double 

 alcohol and second generation of alcohol mice come next. 



The three lines in which the females were alcoholized 

 were somewhat more fecund than the line in which the 

 males alone were alcoholized and decidedly more so than 

 that in which neither parent was alcoholized. These re- 

 sults confirm those obtained in my former work ('11) 

 where the control mice carried 7 months had 2.2 litters or 

 13.3 young on an average and the alcohol mice had 2.8 

 litters and 16.1 young; the second generation of control 

 mice carried 4 months had 1.5 litters and 7.1 young, 

 while the corresponding alcohol line had 1.8 litters or 12.4 

 young. 



Why the mice had fewer young in these experiments 



