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April 29, 1950

Plant Physiology

JAMA. 1950;142(17):1396. doi:10.1001/jama.1950.02910350066033

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This third edition of an English textbook, published in 1947, has been expanded, particularly on the biochemical side. An extensive section on enzymes, particularly oxidative enzymes, zymase and phosphorylase, and new material on photosynthesis and the metabolism of dicarboxylic and tricarboxylic acids are important additions. The first part, "Protoplasm," deals with visible structures, physicochemical and biochemical properties of living material, with a proper strong emphasis on plants. Part two, "The Absorption, Translocation, and Elimination of Water, Solutes, and Gases," deals generally with the movements of materials and includes a discussion of osmotic phenomena, soils and the usual problems of water and solute. Part three, "Nutrition and Metabolism," includes a discussion of general problems and methods as well as specific chapters on photosynthesis, respiration and the polycarboxylic acids. Part four, "Growth and Movement," includes, besides these subjects a chapter on growth substances. Two appendixes offer basic information about organic compounds and

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