N. B.—Owing to lack of space, reviews of a number of new works have been crowded out of the present number of _The Monist_; among which the following will appear in No. 3: _Die Entwickelung des Causalproblems in der Philosophie seit Kant_, by Dr. Edmund Koenig; _Spinoza’s Erkenntnisslehre in ihrer Beziehung sur modernen Naturwissenschaft und Philosophie_, by Dr. Martin Berendt and Dr. Julius Friedländer; _Leitfaden der physiologischen Psychologie_, by Dr. Th. Ziehen; _Handbook of Psychology_, by J. M. Baldwin; _An Essay on Reasoning_, by Edward T. Dixon; _Das Dasein als Lust, Leid und Liebe_, by Hübbe-Schleiden; _Die Bedeutung der theologischen Vorstellungen für die Ethik_, by Wilhelm Paszkowski; and _Einleitung in das Alte Testament_, by Prof. C. H. Cornill. FOOTNOTES: [51] A companion work on the Old Testament has been written by Professor Cornill. We shall review it in our next number. PERIODICALS. VOPROSUI FILOSOFII I PSICHOLOGII.[52] Vol. II. No. 6. September, 1891. CONTENTS: POSITIVE PHILOSOPHY AND THE UNITY OF SCIENCE. By _B. Tchitcherin_. PHILOSOPHY OF THE CHRISTIAN THEOCRACY IN THE FIFTH CENTURY. The Cosmic Views of St. Augustine in his Genesis. By _Prince E. Trubetzkoi_. ETHICS OF LIFE AND OF THE FREE IDEAL (conclusion). By _K. N. Ventzel_. OPINIONS CONCERNING L. N. TOLSTOÏ. By _N. Strachoff_. FROM THE PHILOSOPHY OF HISTORY. By _Vladimir Solovieff_. SPECIAL PART: (1) Fundamental Moments in the Evolution of the New Philosophy. Metaphysical Philosophy: Descartes and Occasionalists. By _N. Grote_. (2) Measurableness of the Simplest Mental Acts. By _E. Tchelpanoff_. CRITICISM AND BIBLIOGRAPHY. Review of Philosophical Periodicals. Book Reviews. APPENDIX: 1) Recent Publications. 2) Transactions of the Moscow Psychological Society.