The author reports in this paper the results of the observation on the developmental process of the female inflorescence in the, hop plant, conducted in 1950 at the Nagano Prefectural Experiment Station. Materials were collected every third day from early in May to early in July during two successive seasons, 1949 and 1950, from the .commerciel variety "Shinshu -wase" prepared from four years stock late in March (1949) or middle in April (1950) at the 10-15th axillary buds. The results are shown in Text-figures 1 and 2 both by microphotographs which were taken from preparations made by the usual paraffin method and the sketches of the external morphology. In this experiment it is determined that most of the flower primordia differentiated during the period from late in May to early in July in both seasons and developmental order of floral organs in each flowerlet was as follows?outer-bract, ovary, inner-bract, stigma and pericarp. Furthermore the author discriminated four stages in the course of differentiation of female inflorescence, namely, non-differentiating stage (la), early stage (initiation of flower primordia, 2a, 2a'), middle stage (differentiation of flowerlet, 3a), late stage (development and completion of flowerlet 4a-6a).
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