VOL. I. The Facts of the Moral Life. _Large 8vo, $2.25_ VOL. II. Ethical Systems. _Large 8vo, $1.75_ VOL. III. The Principles of Morality and the Departments of the Moral Life. _Large 8vo, $2.00_ =W. WUNDT.= =Principles of Physiological Psychology.= Translated by E. B. TITCHENER. VOL. I. Introduction: The Bodily Substrate of the Mental Life. VOL. II. _Preparing._ _Large 8vo, $3.00_ The Animal Behavior Series UNDER THE GENERAL EDITORSHIP OF ROBERT M. YERKES, Ph.D. _Instructor in Comparative Philosophy, Harvard University_ The aim of the Series is to present a number of small volumes which taken together shall form a comprehensive introduction to Comparative Psychology _NOW READY_ The Dancing Mouse By ROBERT M. YERKES, Ph.D. _Cloth, 12mo, xxi + 290 pages, Illus., $1.25_ “Dr. Yerkes’ book is a most interesting example of modern laboratory methods and can be read with profit by any one, on account of the accurate methods of observation and careful deductive reasoning which it shows. An elaborate, painstaking system of experiments was carried on with over 400 mice, with the object of determining muscular coördination, structural peculiarities, strength of the special sense organs, habit formation, educability, and strength of memory of these little animals. Some experiments were also undertaken along the line of inherited peculiarities.... The work is really only a preliminary study, but it will be read with much interest by all students of comparative psychology.”—_Journal of American Medical Association._ The Animal Mind By MARGARET FLOY WASHBURN, Ph.D. _Associate Professor of Philosophy, Vassar College_ _Cloth, 12mo, 333 pages, $1.60_ “As the author points out, the title of this book might more appropriately have been ‘The Animal Mind Deduced from Experimental Evidence,’ for the facts here set forth are very largely the results of the experimental method in comparative psychology. The mass of experimental material that has been accumulated from the researches of physiologists and psychologists is already great, but is also for the most part inaccessible to the ordinary student, being widely scattered and to a considerable extent published in the journals of specialists, which the average college library does not contain. Hence the usefulness of the present ... interesting work.”—_New York Sun._ Creighton’s Introductory Logic BY JAMES EDWIN CREIGHTON Sage Professor of Logic and Metaphysics in Cornell University New York, 1898. Third edition revised and enlarged, with the addition of new Problems and Examples, 1909. Ninth reprint, 1914. _520 pages, $1.40_