Abstract
1. It was chiefly with the purpose of determining the effect of certain conditions upon the ray system of Quercus alba, such as the age of the trees, location of shoots in the trees, and vigorous or suppressed conditions of growth, that this investigation was undertaken. 2. The results obtained indicate that neither the age of the trees nor the location of wood in a tree is an appreciable factor in the modification of the ray system. 3. The conditions of vigorous and suppressed growth, however, are problems to be considered. With decreasing vigor of growth in the mature wood multiseriate rays appear at progressively later stages in the development of the stem. 4. Multiseriate rays, 2-6 cells in width, occur in the seedlings and the first annual ring of Quercus alba only in the vicinity of lateral leaf traces. 5. The peculiar formation of the cambium and wood in the stem of the oak, whereby 5 wedge-shaped segments of secondary xylem are formed, including between them 5 narrow depressed segments, is due dir...
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