their proper places. The reprint is an exact copy of the original, including even typographical errors, excepting only the style of type. Of the original edition only eight copies are known to exist, so that the republication was desirable to preserve the book, as well as for the facilitation of reference, and of this only two hundred and fifty numbered copies are printed for the market. [Footnote 63: Ichthyologia Ohioensis: or Natural History of the Fishes inhabiting the River Ohio and its Tributary Streams. By C. S. Rafinesque. A Verbatim and Literatim Reprint of the Original, with a Sketch of the Life, the Ichthyologic Work, and the Ichthyologic Bibliography of Rafinesque. By Richard Ellsworth Call. Cleveland: The Burrows Brothers Company. Pp. 175. Price, $4.] Mr. _Douglas Houghton Campbell_ has endeavored, in his _Lectures on the Evolution of Plants_,[64] to present in as untechnical a manner as seemed feasible the more striking facts bearing upon the evolution of plant forms, believing that it will fill an existing want among English text-books. The substance of the work was given originally in the form of lectures to classes in Leland Stanford Junior University. After an introduction, in which a few fundamental principles are presented, elementary structures are defined, and accepted classification is mentioned, the conditions of plant life are treated of as relating to food substances, water, life, division of labor, and movements, of which all plants exhibit more or less marked ones, that may be spontaneous. While in the simple unicellular plants all the functions are performed by a single cell, a gradual division of labor takes place as we go up, first in a separation of the vegetative and reproductive cells, and later a further specialization of both vegetative and reproductive functions, culminating in the seed plant. This course is described as exemplified in the simplest forms of life, algæ, fungi, mosses and liverworts, ferns, and seed plants of the different classes. The study of the geological relations, fragmentary as their teachings are, has yielded most important evidence for tracing the succession of plant forms. Observation of geographical distribution casts much light on the subject. The relations of animals and plants have an important bearing. The influence of the environment embraces many factors, and is often shown in conspicuous features of form and structure adapting plants to certain sorts of conditions and enabling them to resist others. Plants have thus succeeded in adapting themselves to almost every environment. [Footnote 64: Lectures on the Evolution of Plants. By Douglas Houghton Campbell. New York: The Macmillan Company. Pp. 319. Price, $1.25.]