The relationships in protein constituents of seeds between the F_1 hybrid and its parental varieties of cucumber were analyzed by means of serological method. The F_1 hybrid appeared to be different from its parental varieties in quantitative proportions of each component. The difference was especially significant in quantity of the component forming the precipitin line (α). That is, the F_1 hybrid has possessed a larger amount of this component than the parental varieties. In immunoelectrophoresis, this component migrated toward anode. There were scarcely any appreciable differences in precipitin arcs among several cucumber varieties. On the other hand these cucumber varieties appeared to be distinctly different from Cucumis melo and Cucurbita maxima in their immunoelectrophoretic patterns. These differences were more significant than thosebetween the F_1 hybrid and its parental varieties of cucumber. These findings suggest that the differences between the F_1 hydrid and its parents would be less in extent as compared with the inter-specific differences, and on a level with intra-specific differences.
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