THE nitrogenous changes in mature Kelsey plums during storage appear to differ fundamentally from those in the apple. The most striking feature of the nitrogen metabolism of the apple is its phase of net synthesis of protein during the final stage of development on the tree [Hulme, 1936]. This drift towards protein synthesis is also characteristic of "mature ", detached apple-fruits [Hulme, 1932]. Mature Kelsey plums, on the other hand, show a distinct drift towards protein breakdown when stored at either 35 or 700 F. [Donen, 1937, 2]. Hulme [1935] has shown, however, that the nature of protein changes in the stored apple depends upon its stage of physiological development: thus " young " apples display the same characteristics as "mature" plums and on storage at 1 or 120 C. show protein breakdown. It is possible then that the nitrogenous changes in the plum during its full development to maturity do not proceed further than the stage corresponding to "young" fruit in the apple. The most important steps in the nitrogen cycle of the growing plum have therefore been ascertained and are presented in this paper. EXPERIMENTAL Material and method of sampling. Two series of samples were collected. The object was to gauge whether fruit collected from trees grown under different environmental and cultural conditions showed any marked variation in the relationship between the estimated nitrogenous compounds. Series I. The fruit was collected from 14 Kelsey trees worked on peach stock at Elgin, Cape. The trees were 9 years old and somewhat stunted in growth. Soil pebbly and poorly weathered. Petal fall on
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