The induction, development, and heritability of fasciations . ch are depend-ent on the dispositon of the othercortical tissues. As the circum-ference of the stem becomes greaterthe g-roups of bast become fartherapart, while at the same time, asa result of the radial pressures setup, the rings are approximatednearer and nearer to each most notice able effects of thesechanges occur naturally in the moreperipheral portions of the primary medullary rays inyoung stems extend to the hard-bast ring, and when by thegrowth of thestem this is broken up and its members are connected
The induction, development, and heritability of fasciations . ch are depend-ent on the dispositon of the othercortical tissues. As the circum-ference of the stem becomes greaterthe g-roups of bast become fartherapart, while at the same time, asa result of the radial pressures setup, the rings are approximatednearer and nearer to each most notice able effects of thesechanges occur naturally in the moreperipheral portions of the primary medullary rays inyoung stems extend to the hard-bast ring, and when by thegrowth of thestem this is broken up and its members are connected by stony tissue therays extend to the stoity tissue of this ring-. Secondary hard-bast ring-s areformed within the primary one, between the segments of which pass themedullary rays. With the growth of the stem the outer g-roups of sec-ondary bast separate from one another, just as happened with the primarybast groups, and the more peripheral rings become closely pressed general relations not easily described will be apparent from Fig. \2.—Prosopis velutina: Detail from in-ner portion of cortex of stem, to showstructure of distal ends of medullary raysand connection between outer mass of chlo-rophyll {ch. b.) and the more deeply lyingchlorenchyma. , hard bast; ch. b., cor-tical chlorophyll band. 28 TOPOGRAPHY OF CHLOROPHYLL APPARATUS IN DESERT PLANTS.
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