The induction, development, and heritability of fasciations . .m g^^ >^%i*.. ZIZYPHUS PARRYI. Branch from a plant which is situated by the St. Marys Roadnear the laboratory domain. Zizyphus is a plant with the deciduous 25, 1907. GENERAL DISCUSSION. 33 GENERAL DISCUSSION AND OF THE CHLOROPHYLL-BEARING TISSUES. Although different in details, the g-^neral arrangement of the chlorophyllapparatus in the stems of desert perennials has in many respects a closesimilarity, for which reason the type aiTangement can be presented bydescribing an ideal stem. The ideal bra
The induction, development, and heritability of fasciations . .m g^^ >^%i*.. ZIZYPHUS PARRYI. Branch from a plant which is situated by the St. Marys Roadnear the laboratory domain. Zizyphus is a plant with the deciduous 25, 1907. GENERAL DISCUSSION. 33 GENERAL DISCUSSION AND OF THE CHLOROPHYLL-BEARING TISSUES. Although different in details, the g-^neral arrangement of the chlorophyllapparatus in the stems of desert perennials has in many respects a closesimilarity, for which reason the type aiTangement can be presented bydescribing an ideal stem. The ideal branch will have a diameter of 5 mm., with the followingstructural divisions: (l) an epidermis with a relatively heavy cuticle;(2) a hypodermal tissue about three cells in thickness; (3) an outer corticalchlorophyll band, which is somewhat wider than the hypoderm and whichlies immediately beneath it; (4) a hard-bast ring; (5) the inner portion ofthe cortex, in which are the distal ends of the medullary rays, perhapssecondary hard bast and undifferentiated ground-tissue; (6) the
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