Abstract
1. To test for the existence of maternal effects in Drosophila melanogaster, approximately isogenic stocks of Dichaete, pyd, vg, M-3, M-4 were prepared. Reciprocal crosses were made between each stock and Dichaete, and between Dichaete and non-Dichaete siblings. The results, as indicated by posterior dorso-central (i.e., average number of dorsocentral bristles per hemithorax), of the Dichaete progeny show that no significant differences arose within six pairs of reciprocal crosses. The reciprocal crosses of four other pairs of experiments yielded significant differences in bristle indices. Two of these pairs were alike in type of crosses, but different in type of culture method. The sign of the differences in bristle indices was reversed in these two sets of experiments, the progeny with the higher indices coming from Dichaete mothers in one case, and from Dichaete fathers in the other.2. Tests of homogeneity show that within crosses, all bottles of which have had identical treatment, di...
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