No. 625] SHORTER ARTICLES AND DISCUSSION 



187 



One other point of some interest should be noted. In 1915 

 the writer reported on the hereditary behavior of black-eyed 

 white spotting in mice. At that time it was found that this 

 character behaved in a similar manner to yellow in that no 

 animal homozygous for it was obtained. Later it was found 

 (1917) that black-eyed white spotting was, however, entirely in- 

 dependent of yellow in heredity, although its behavior was 

 analogous. 



If the uteri of black-eyed white females which are pregnant 

 by black-eyed white males are examined they are, in some cases, 

 found to contain a certain number of abnormal embryos of the 

 same gross appearance as those occurring in the yellow X yellow 

 matings. The numbers obtained are small but striking. 



TABLE III 



Black-eyed White A X Black-eyed W'b 



11413 X 



Black-eyed AVhite B X Black-eyed \V1. 

 — 73 X Black-eyed Wli 



The percentage of abnormal embryos is 27.2. Wliib' tliis last 

 mentioned cross should be repeato.l it Jievcrtlieloss indicates 

 that, like the homozygous yellow embryo, the homozygous black- 

 eyed white embryo breaks ih)wn. in most cases at least, after its 

 implantation in the uterus. 



C. C. Little 



December 2, 1918 



LITERATURE CITED 



191 7'. Anat. Record, Vol. 11, pp. 480-481. 



Little, O. C. 



191.->. AM. NAT.. Vol 49, P^ ^'-J^'"^^- 



