IN this pamphlet of thirty-nine pages, Dr. Barkley gives a series of dichotomous keys referring chiefly to the orders of the various ‘plant’ phyla. The keys have been drawn up to meet the needs of the author's class in plant morphology and have been so constructed as to reflect in large part the views of outstanding authors regarding certain groups. They are intended to give also a more or less comparative treatment of the ordinal category under the various phyla.

Keys to the Phyla of Organisms, including Keys to the Orders of the Plant Kingdom

By Fred A. Barkley. Pp. iv + 40. (Missoula, Montana: Associated Student's Store, 1939.) 75 cents.

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M., J. Biology. Nature 145, 494 (1940).

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