3U4 



Reconls of Hybrid Rahbits 



Mi^iuk'liaii priiiciples. Thu bück and lioe albiuo, brotber and sister, were closely 

 iubrcd truiu black stock. 



I 



i (21) B 



I 



9(2)Ä i{\)B 

 I I 



9(37)i? 



I 



$(14)/f i{\)D 9{2)ü 6{i)n ?(14)Ä 



1 L , 1 1 , 1 



(J(21)Ä $(37)Ä 



I , I 



6 (112) w 



$ (13G) FF 



I 



(294) ir (295) ir (296) W (297) W (298) W 



(299) W (300) H' 



In addition to the foregoing a fcw crosses were made between the white bück 

 (112) and a biowiiish yellovv (108), herseif the descendant of black ancestry. 



Table IV briiigs out the curious fact that among 10 of her young, her own 

 colour does not appear at all. 



TABLE IV. 



Such a result continually obtained would not bo in keeping with Galton's Law, 

 since at least 2573 '^^ ^he offspring ought to be yellow a.s a result of the iiifluence 

 of one of two parents. It can perhaps be c.xplained by Meudel's principles when a 

 further knowledge of coloration enables us to say how yellow is broken up when 

 conibined with pure gametes like tho.se produrcd from albinos. This ma}' be 

 similar to tiic " mosaic inheritauce " described by Castle (8) and (-t). 



I have made as yet no accurate correlations to test the Galtou-Pearson Law of 

 Ancestral Heredity, as I wi.sh to have later generation.s giving a raore coniplete 

 back pedigree and larger Hgures, before such is attenipted. Rough draughts, 

 however, show that there is a wide discrepaucy of froni 15 °/^ to 25 % froin the 

 calculated. 



Iii the case of W x 11' thi.s is cven worse, since the amount of black in the 

 grandpareuts and great-grandparents call.s forSO''/^ to 4ö"/^ black in offspring, 

 whereas we find none at all. The experimeuts, therefore, coufirni the idea that 

 the Law of Ancestral Heredity will not hold so well in cases of alternative 

 inheritance as it does when applied to characteristics which freely blend. 



The resnlts set forth in Davenport's review of von Guaita's experiments (8) 

 in brecding mice are also continned. 



