Abstract
The author (Yagi 1962b, 1963, 1966) previously reported the fact that the quantity of the nile blue granules observed in the fat-body cells of the prepupa of D. melanogaster has the positive correlation with the amount of the brown pigment in the adult eyes. In order to confirm this fact, various experimental crosses were made among five different strains and the resulted F1 hybrids were tested for the quantities of the N.B.G. in relation to their eye colors. In results, it was proved that, whichever type their parents belonged to, the offspring whose prospective adult eye colors were the normal with enough amount of the brown pigment contained the large quantities of the N.B.G. in the prepupae, while the offspring whose prospective eye colors were paler than the normal with the lack or insufficient amount of the brown pigment contained less amount of the N.B.G. These results suggest that the genetic factors controlling the quantity of the N.B.G. and the amount or production of the brown pigment are the common.
