Article beginning on page 43.
Psyche 15:43, 1908.

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TWO BOOKS OF EVOLUTION
TWO BOOKS ON EVOLUTION.
THERE is a growing demand for elementary treatises upon the subject of Organic Evolution, in which the more important theories are presented briefly and with rea- sonable impartiality. President Jordan and Professor Kellogg have recently made a welcome contribution1 to this class of literature. Teachers of Zoology will recognize in evolution and Animal Life9> many illustrations and passages of text which first appeared in the school book "Animal Life,>' by the same authors; and will value them more highly in their new setting. The new volume is fully twice as large as the earlier one, and is meant for maturer readers, though admirably suited for use as a reference book in secondary schools. The new title happily avoids confusion with that of Karl Semper's classic work.
Professor Kellogg's "Darwinism T~-day"~ is a scholarly statement of evidence and arguments for and against the Darwinian ideas of species-forming, designed to show the place which Darwinism holds in the growing pattern of modern biological theory. Perhaps too solid a treatise to attract popular attention, it is nevertheless most interestingly written, and must commend itself strongly to the educated laymati and the professional biologist alike. The notes and citations appended to the chap- ters give a convenient synopsis of literature dealing with Darwinism, on a scale which has not been attempted in any other work of the kind. This feature is in- . rnensely valuable.
Careful readers will lament the small size and occasional indis- tinctness of the figures by which references to notes are made (those in the body of the book are of the same size as the ones used in PSYCHE'S foot-notes); but this is a minor fault. There is scant room for lamentation in the midst of the enthusiastic welcome which the book deserves.
w. L. w. F.
1 Evolution and Animal Life.
An elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals.
By David Starr Jordan and Ternon Lyman Kebogg. New York:
D. Appleton & Go. 1907.
2 Darwinism To-day. A discussion of present-day scientific criticism of t,he Darwinian selection theories, togelher with a brief account of the principal other proposed auxiliary and alternative theories of species-forming. By Vernon L. Kellogg. New York: Henry Holt & Go. 1907.



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