672 THE AMERICAN NATURALIST [Vol. XLVII 



small and weak young, Nos. 124 ?, 125 J, both died when 

 one month old. 



In the group of 11 matings, 4 were between normal 

 males and normal females, control matings, three were 

 between alcoholic males and normal females, and three 

 between normal males and alcoholic females. All of 

 these produced offspring as noted, while the single mating 

 between an alcoholic male and an alcoholic female gave a 

 negative result although the animals were kept together 

 as long as the individuals of any of the other pairs, 

 17 days. 



One of the alcoholic females gave two young which 

 died within a month. 



A second group of 18 matings made during November, 

 1912, are recorded as follows : 



Nov. 4, 2d Gen. ? 100 X 2d Gen. # 92 = 0.— Together 

 very long, though failed to take. 



Nov. 4, 2d Gen. $ 101 X 2d Gen. S 99 = 0.— Together 

 very long, though failed to take. 



Nov. 15, 2d Gen. ? 91 X 2d Gen. $ 92 = Feb. 18, 1913— 

 One large young, apparently normal, No. 170 



Nov. 15, 2d Gen. $ 98 X 2d Gen. <$ 99 = 0.— Failed to 

 take, though together six weeks. 



Nov. 16, 2d Gen. ? 76 X 2d Gen. £ 77 = Jan. 28, 1913— 

 Three defective young, one eyeless, all died within 10 

 days. 



Nov. 16, Nor. $ 88 X 2d Gen. $ 78 = Feb. 20, 1913— 

 One large young apparently normal, No. 171 $ (long 

 gestation). 



Nov. 16, Ale. ? 66 X Ale. c? 5 = 0. 



Nov. 16, Nor. ? 87 X 2d Gen. S 75 = Jan. 27, 1913— 

 Two normal young, Nos. 140 % 141 J 1 . 



Nov. 16, Nor. ? 19 X Ale. J 6 = Jan. 30, 1913— Three 

 small weak young, two died shortly after birth, one No. 

 146 $ survived. 



Nov. 16, Nor. ? 34 X Ale. £ 43 = Feb. 4, 1913— Two 

 normal young, Nos. 156 $, 157 J. 



