Abstract
IN contrast to the earlier widely accepted concepts of the structure and growth of the shoot apex, Buvat and his associates1–3 have proposed an alternative interpretation. According to this newer view the most apical, axial cells of shoot apices in a variety of plants do not have histogenic or organogenic roles during vegetative growth. The criterion of activity was based on the frequency of mitosis. This information was obtained by counting mitotic figures in various zones of the shoot apex and then presenting this information in the form of a composite diagram. The results of these investigations have been challenged by Gifford4 and by Popham5; the latter used essentially the same methods as did the French workers.
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