On the macro-chemistry of the endodermis

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Abstract
As the result of maceration in water, some 110 gm. of endodermis from the stem of Potamogeton and 0.6 gm. of endodermis from the root of Hyacinth were studied macrochemically, with the following conclusions: (1) the primary endodermis contains free fat and other fatty derivatives, in some form of combination, yielding on saponification normal and oxidised fatty acids. (2) In its secondary and tertiary stages the endodermis contains suberin-like materials similar to those found in potato cork. (3) As in potato cork, the suberin lamella arises from fatty substances as the result of oxidation and drying processes. The relative increase in the combined insoluble fatty anhydrides, as in the case of regenerated potato cork, appears to take place at the expense of free fat or fatty acid. (4) The basal substance of the Casparian strip contains no N, but some substance containing N and S is closely knit into the fabric of the strip.

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