New " Open Court " Sc ientific Books 



FOURTH THOUSAND JUST PUBLISHED 



Mr. Bertrand Russell's "Lowell Lectures" of 1914. 



Our Knowledge of the External World as a Field for Scientific Method in 

 Philosophy, x., 245 pages. Cloth, 7s. 6d. net. 

 " This brilliant, lucid, amusing book, which, in spite of a few stift passages, everyone can under- 

 stand." — The, New Statesman. 



" The book of the year. . . . It is in every sense an epoch-making book." — Cambridge Magazine. 



" His method interests by the success with which it approximates philosophy to science. . . . 



These able and suggestive lectures will introduce thoughtful readers to a tract of speculative inquiry 



not yet much opened up, which promi.--es good results to men with philosophic interests and scientific 



training." — Scotsman. 



"The author maintains the fresh and brilliant yet easy style which always makes his writings a 

 pleasure to read."— Nature. 



"This book, though intentionally somewhat popular in tone, contains some most important and 

 interesting contributions to philosophy."— ./7//W. 



NEW, REVISED, AND ENLARGED EDITION. 



The Analysis of Sensations and the Relation of the 



Physical to the Psychical. By Ernst Mach, translated from the first 

 German Edition by C. M. Williams; revised and supplemented from the fifth 

 German edition by Sydney Waterlow, M.A. Pp. xvi., 380. Cloth, 6s. 6d. net. 

 A SUPPLEMENTARY VOLUME TO MACH'S "MECHANICS." 



The Science Of Mechanics I A Critical and Historical Account 

 of its Development. By Ernst Mach. Supplement to the third edition, con- 

 taining the author's additions to the seventh German edition, translated and 

 annotated by Philip E. B. Jourdain, M.A. Pages xiv., 104. Cloth, 2s. 6d. net. 



This volume brings up to date the existing third edition of the translation of Mach's greatest work, 

 and thus allows the public to complete the work at a low price. A portrait of Newton and some notes 

 oved by the author), added by the translator to complete or rectify parts of the " Mechanics," 

 are included. 



Essays on the Life and Work of Newton. By Augustus 



De Morgan. Edited, with Notes and Appendices, by Philip E. B. Jourdain, 

 M.A., xiv., 198 pages. Cloth, 5s. net. 



No other modern work calls attention to the fact that Newton left important manuscripts on 

 fluxions. 



" These essays, written more than half a century ago, are still worth reading, both for their matter 

 and their style. . . . The editor is to be congratulated on a piece of good work." — Nature. 



" No engineer with any scientific training will fail to find it of interest." — American Machinist. 



" The late Professor Augustus De Morgan was one of the few mathematicians who have possessed 

 the art of writing with lucidity and point for the general reader. It was a happy thought which led 

 Mr. Philip E. B. Jourdain to leprint his three 'Essays on the Lite and Work of Newton' from 

 forgotten periodicals. "—Spectator. 



" Excellent essays dealing with that perennially interesting intellectual giant, Isaac Newton." — 

 Chicago Journal. 



A Budget Of Paradoxes. By Augustus De Morgan. New 



Edition, with Notes and Index by D. E. Smith. Two volumes of about 500 

 pages each. Cloth, 30s. net the set. 



Of the new "OPEN COURT" CLASSICS OF SCIENCE AND PHILOSOPHY, the 

 following volumes have been already published :— 



No. 1. Contributions to the Founding of the Theory of 



Transfinite Numbers. By Georg Cantor. Translated, and provided 



witli an Introduction and Notes, by Philip E. B. Jourdain, M.A. Cloth, 



3s. 6d. net. 

 A translation of the two very important memoirs of Cantor on transfinite numbers which appeared 

 in 1895 and 1897. A very full historical account of Cantor's previous work and the work of others 

 which led up to it is given in the introduction, and the notes at the end contain indications of the 



ress made in the theory of transfinite numbers since 1897. This book is a companion volume to 

 Dedekinds " Essays," of which a translation has been issued by the present publishers. 



No. 2. Selections from the Scottish Philosophy of 



Common Sense. Edited by G. A. Johnston, M.A., Lecturer in Philosophy 

 at Glasgow University. Pages viii, 267. Cloth, 3s. 6d. net. 

 The selections have been made from Reid, Stewart, Beattie, and Ferguson. Most of the selections 



are metaphysical or psychological, but ethical doctrines have not been neglected. In the introduction 



an attempt has been made to estimate Reid's historical importance. 



THE MONIST (Quarterly, 2s. 6d. per number, 9s. 6d. per year, post free) 

 contains articles of scientific and philosophical interest. 



THE OPEN COURT COMPANY, 149 Strand, London, W.C.2. 



Entered at the New York Post Ojfice as Second-class Matter. 



