No. 640] DATA COXCEBXIXG UXKAdE JX MICE 419 



In agreement with the views of previous investiga- 

 tors, it is shown by new and conclusive experimental 

 data that the following pairs of genes in mice assort in- 

 dependently and are not linked. On the chromosome 

 hypothesis, the members of each pair are located in dif- 

 ferent chromosomes: (1) the genes for agouti (A) and 

 for piebald spotting (s) ; (2) the genes for agouti (A) 

 and for black-eyed-white spotting (W) ; (3) the genes 

 for pink-eye (p) and for black-eyed-white spotting (W). 



