The Problem of Space in Jewish Medieval Philosophy. Israel Isaac Efros, Ph.D. Columbia University Press, 1917. Pp. viii, 125. $1.50.Saadia's Polemic against Hiwi Al-Balkhi. Israel Davidson. Published by the Jewish Theological Seminary of America. A Fragment edited from a Genizah MS., with a Facsimile. New York. 1915. Pp. 104. $1.00.Scrolls. Essays on Jewish History and Literature and Kindred Subjects. Gotthard Deutsch. 2 vols. Bloch Publishing Co. New York. 1917.