The current numbers of _The Open Court_ contain valuable original articles from the pens of distinguished thinkers. Accurate and authorised translations are made in Philosophy, Science, and Criticism from the literature of Continental Europe, and reviews of noteworthy recent investigations are presented. Portraits of eminent philosophers and scientists are published, and appropriate illustrations accompany some of the articles. Terms: $1.00 a year; $1.35 to foreign countries in the Postal Union. Single Copies, 10 cents. THE MONIST A QUARTERLY MAGAZINE OF PHILOSOPHY AND SCIENCE. _THE MONIST_ discusses the fundamental problems of Philosophy in their practical relations to the religious, ethical, and sociological questions of the day. The following have contributed to its columns: PROF. JOSEPH LE CONTE, DR. W. T. HARRIS, M. D. CONWAY, CHARLES S. PEIRCE, PROF. F. MAX MÜLLER, PROF. E. D. COPE, CARUS STERNE, MRS. C. LADD FRANKLIN, PROF. MAX VERWORN, PROF. FELIX KLEIN, PROF. G. J. ROMANES, PROF. C. LLOYD MORGAN, JAMES SULLY, B. BOSANQUET, DR. A. BINET, PROF. ERNST MACH, RABBI EMIL HIRSCH, LESTER F. WARD, PROF. H. SCHUBERT, DR. EDM. MONTGOMERY, PROF. C. LOMBROSO, PROF. E. HAECKEL, PROF. H. HÖFFDING, DR. F. OSWALD, PROF. J. DELBOEUF, PROF. F. JODL, PROF. H. M. STANLEY, G. FERRERO, J. VENN, PROF. H. VON HOLST. Per Copy, 50 cents; Yearly, $2.00. In England and all countries in U.P.U. per Copy, 2s 6d; Yearly, 9s 6d. * * * * * CHICAGO THE OPEN COURT PUBLISHING CO., Monon Building, 324 Dearborn St., LONDON: Kegan Paul, Trench, Trübner & Co. Transcriber's note: _Underscores_ have been used to indicate _italic_ fonts. End of Project Gutenberg's Popular scientific lectures, by Ernst Mach