The transmission of a-acid content and time of ripening in female hop seedlings was studied over periods of 3 and 4 years respectively. The inheritance of a-acid content in seedling populations having female parents with a low a-acid content was determined by the a-acid content of the male parent, while the average a-acid content of populations with "high" female parents was shown to be Inversely proportionate to the a-acid contents of those parents. There were indications, however, that a-acid content of the female parent of males also played a role in determining the a-acid content of the female progeny in the second generation. Between-population variations in time of ripening were relatively small. It was found that the time of ripening was predominantly determined by the female parents of the populations.