[35] The Elements of Sociology. By Franklin Henry Giddings. New York: The Macmillan Company, 1898. Pp. 353. Price, $1.10. [36] The Nature and Development of Animal Intelligence. By Wesley Mills, F.R.S.C. New York: The Macmillan Company. Pp. 307. Price, $2. [37] Four-Footed Americans and their Kin. By Mabel Osgood Wright. Edited by Frank M. Chapman. New York: The Macmillan Company. Pp. 432, with plates. Price, $1.50. [38] The Groundwork of Science. A Study of Epistemology. By St. George Mivart. Pp. 328. Price, $1.75. New York: G.P. Putnam's Sons. London; Bliss, Sands & Co. [39] Commercial Cuba. A Book for Business Men. By William J. Clark. Illustrated. New York: Charles Scribner's Sons. Pp. 514, with maps. [40] Living Plants and their Properties. A Collection of Essays. By Joseph Charles Arthur (Purdue University) and Daniel Trembly MacDougal (University of Minnesota). New York: Baker & Taylor. Minneapolis: Morris & Wilson. Pp. 234. [41] The Study of the Child. A Brief Treatise on the Psychology of the Child, with Suggestions for Teachers, Students, and Parents. By A.R. Taylor. New York: D. Appleton and Company. (International Education Series.) Pp. 215. Price, $1.50. [42] The Discharge of Electricity through Gases. Lectures delivered on the occasion of the Sesquicentennial Celebration of Princeton University. By J.J. Thomson. New York: Charles Scribner's Sons. Pp. 203. Price, $1. [43] The Story of the Mind. By James Mark Baldwin. New York: D. Appleton and Company. Pp. 232. Price, 40 cents. [44] A Catalogue of Scientific and Technical Periodicals 1665-1895, together with Chronological Tables and a Library Check List. By Henry Carrington Bolton. Second edition. City of Washington: Published by the Smithsonian Institution. Pp. 1247. [45] Theories of the Will in the History of Philosophy. By Archibald Alexander. New York: Charles Scribner's Sons. Pp. 357. Price, $1.50. [46] Applied Physiology for Advanced Grades. Including the Effects of Alcohol and Narcotics. American Book Company. Pp. 432. Price, 80 cents. [47] Inorganic Chemistry according to the Periodic Law. By F.P. Venable and James Lewis Howe. Easton, Pa: The Chemical Publishing Company. Pp. 266. Price, $1.50. Fragments of Science.