No. 57G] VARIATION IN DEOSOPIIILA " 1 & 



case of vellow mice, Baur's Aurea-stmin of Antirrhinum 

 (Baur, 1912) and the modified sex-ratios in Drosophila 

 reported by Morgan (1912d) are examples of this phe- 

 nomenon. 



The object of the present paper is to describe a case of 

 inheritance in Drosophila that for some years seemed to 



