Abstract
1. The root of the soy bean is developed according to JANCZEWSKI'S fourth angiospermous type, and at maturity is a tetrarch radial protostele which, as COMPTON (2) and DE CANDOLLE (1) point out, is common to many Leguminosae and especially to the Phaseoleae of which the soy bean is a member. A conical mass of parenchymatous cells comprises the root cap. The epidermis consists of a single layer of cells from which root hairs arise. The cortex is composed of several layers of parenchymatous cells and the endodermis and pericycle are each a single layer. Secondary roots arise from the Pericycle. The anatomy of the secondary root is similiar to that of the primary root except that usually only one large metaxylem vessel is matured in the center of the root instead of several. The protoxylem of the primary root consists of one to three spiral-reticulate vessels. The metaxylem matures in two stages and differentiates as pitted vessels and parenchyma. Part of the primary phloem is crushed at the initiation of ...
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