Abstract
Females of Sa.-B (Sapporo) strain were crossed with males of Hi.-A (Hirosaki) strain. And a female of Sa.-A strain was crossed with a male of Ni.-A (Niigata) strain. All individuals of the first generations were males, as shown in Table 1. As already pointed out by Goldschmidt ('34), these results are indisputably due to sex reversal of the genetical daughters (XY) into the males. All of these are not able to be distinguished from the normal males (XX) in their external characteristics, as well as in the structure of testes. In the reciprocal crosses attempted, the females produced normal sons and daughters (Table 2).
