The induction, development, and heritability of fasciations . 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 In the young- stem the medullarj rays of the cortex are about one cellwide, but as the hard-bast groups separate from each other with the gfrowthof the stem the rays broaden to fill out the resulting- gaps
The induction, development, and heritability of fasciations . 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 In the young- stem the medullarj rays of the cortex are about one cellwide, but as the hard-bast groups separate from each other with the gfrowthof the stem the rays broaden to fill out the resulting- gaps until the endsare many cells wide. The most striking effect is associated with the pri-mary rays. They feel the effects of the growth sooner than the other raysand of a consequence the ends of the primary medullary rays are fan-shaped and present in cross-section a very striking- appearance. From thismanner of differentiation and development of tissues the amount of chloren-chyma in the young cortex is much increased. Growth of the stem works alsoto modif} the relations of theouter chlorophyll band in away that may be noted. In abranch mm. in diameter anunbroken ring of hard bastsejxiratcs the chlorophyll bandfrom the inner cortical a branch mm. in diameterthe hard-bast ring becomes bro-ken up into g-roups, as was de-scribed above. The connecting-cells at first wi
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