Survey of Anatomy, Ergastic Substances, and Nuclear Size in Echinocystis macrocarpa and Cucurbita pepo

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Abstract
The nuclei of E. macrocarpa 4, 9, and 85 [mu] in diam. in typical cells of apical meristem, cambium, and differentiating vessel segments, measure 33, 432, and 330,000 cubic [mu] in volume. The nucleus thus may increase 10,000-fold in size. Contraction of nuclei in absolute alcohol indicates 38-80% by volume of free water. In Cucurbita the largest nuclei measure 66 [mu] in diam., 163,000 cu. [mu] in volume. The anatomy of the shoot, tuber and fruit of Echinocystis is described in detail.

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