Abstract
Abstract Evidence is presented for the volatile constituents of hops, not only in the resin glands, the so-called lupulin, but also in the stalk with leaves and in the three crops of cones during ripening. Lupulin shows a specific accumulation of myrcene, and the amount of the volatile constituents increases from fifty times to eight hundred times that in any other part of the plant in the course of ripening. While ripe cones contain neither any germacratrienes, the precursors of several sesquiterpenes, nor any aliphatic aldehydes, the stalk with leaves and the young cones have quite high concentrations of them respectively. Observation suggests that some of the volatile constituents are formed a t an early stage of growth, whilst others are formed later.
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