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be certain of no doctrine, but the most we can do to establish it is to show that the balance of probabilities is in favor of it; that philosophy is the life of science and science the vital breath of philosophy, and if one is severed from the other both pine away and die; and that those scientific researches are successful which are not exclusively special, but are illuminated by an ample idea of science. The book is the outcome of a series of lectures given to classes in Union College to supplement their work in formal logic.

The Text-Book of Geodetic Astronomy[1] was prepared by Mr. John F. Hayford to meet the conditions of the course at Cornell University, the terms of which the standard works now in use could not be made to fit. The purpose of the book is to furnish a text short and easy enough to be mastered by the student of civil engineering in a single college term which shall give him a sufficiently exact and extensive knowledge of geodetic astronomy to serve as a basis for practice in that line after graduation. While it is primarily a manual for students, the author has endeavored to insert such matter, tables, and convenient formulas as would make it of value also to the engineer making astronomical observations. Mathematical processes have been omitted, except those that are actually necessary for developing the working formulas, and simple and special means for deriving the formulas have been chosen in every case admitting choice. Considerable attention has been devoted to a discussion of the various sources of error in each kind of observations. Those formulas have been selected, so far as possible, that lead to accurate and rapid computation.

L'Année Psychologique[2] of M. Alfred Binet and his colaborers in the Laboratory of Physiological Psychology of the Sorbonne, Paris, is now in its fourth year, and the four volumes present a compendium of the psychological studies and literature of the period they cover, the value of which will be appreciated by any one who has occasion to examine the work. The first volume was a book of 619 pages, with 33 figures; the second, of 1010 pages, 141 figures, and several plates; the third, of 825 pages, 103 figures, and numerous plates; and the present volume has 849 pages and 117 figures. The plan of all the volumes is the same; it is to present in full the labors of the laboratory, with original memoirs, and to give a condensed but adequate and classified summary of the world's literature of the year relating to the subject. The present volume contains twenty-seven original memoirs, mostly by Professor Binet and M. N. Vaschide, with others by M. B. Bourdon and Mr. A. Le Clère; about ninety reviews of books and papers, classified under sixteen heads, according as they relate to the physiology of the nervous system, the several senses, mental faculties and operations, movements, individual psychology and character, sleep, dreams, and pathological cases, and animal psychology; a bibliography, also classified, of 123 pages; and an index of authors, occupying 17 double-columned pages.

Prof. Cyrus Thomas has given, in his Introduction to the Study of North American Archæology[3] a brief summary of the progress in the investigation and study of the subject which has been made up to the present time. The increased activity among students, the numerous explorations made, the accumulation of data and the flood of light thrown on questions relating to prehistoric North America since the publication of the last general work on it seemed to call for such a summary. While the author's chief object is to present and arrange the-data so as to afford the student some means of bringing into harmony and utilizing the facts and materials at hand, yet, in view of the impossibility of presenting a full account of the archæological remains of the continent, and discussing all the questions connected with them in a single small volume, only those considered the best representatives of the

  1. A Text-Book of Geodetic Astronomy. By John F. Hayford. New York: John Wiley & Sons. Pp. 851, with plates.
  2. L'Année Psychologique. Edited by Alfred Binet—with the Collaboration of H. Beaunis, Th. Ribot and Bourdon, Courtier, Farrand, Flournoy, Philippe, Vaschide, and Warren. Editorial secretary, Victor Henri. Fourth year. Paris: Librairie C. Reinwald. Schleicher Brothers, publishers. Pp 849. Price, 15 francs.
  3. Introduction to the Study of North American Archæology. By Prof. Cyrus Thomas. Cincinnati: The Robert Clarke Company. Pp. 391.