Public Opinion and Political Dynamics. By Marbury Bladen Ogle Jr., (Boston: Houghton Mifflin Company. 1950. Pp. v, 362, $3.50.)The Discourses of Niccolo Machiavelli. Translated with an introduction by Leslie J. Walker. (New Haven: Yale University Press. 1950. 2 Vols. Pp. xiii, 585; v, 390. $15.00 per set.)A Study of Power; World Politics and Personal Insecurity. By Harold D. Lasswell. Political Power. By Charles E. Merriam. Power and Conscience. by T. V. Smith. (Glencoe, Illinois: The Free Press. 1950. Pp. v, 307; vii, 331; xv, 373. $6.00.)The Open Society and Its Enemies. By Karl R. Popper. (Princeton: Princeton University Press. 1950. Pp. xii, 732. $7.50.)Perspectives on a Troubled Decade; Science, Philosophy, and Religion, 1939–1949. Edited by Lyman Bryson, Louis Finkelstein and R. M. MacIver. (New York: Conference on Science, Philosophy and Religion. Distributed by Harper & Brothers. 1950. Pp. xvii, 901. $5.50.)Mid-Century; The Social Implications of Scientific Progress. Edited and annotated by John Ely Burchard. (Cambridge & New York: Massachusetts Institute of Technology Press and John Wiley and Sons, Inc., joint publishers. 1950. Pp. xx, 549. $7.50.)Social Philosophies of an Age of Crisis. By Pitirim A. Sorokin. (Boston: Beacon Press. 1950. Pp. xi, 345. $4.00.)The Economics of Collective Action. By John R. Commons. (New York: Macmillan Company. 1950. Pp. xii, 414. $5.00.)Geschichtsschreibung und Weltanschauung; Betrachtungen zum Werk Friedrich Meineckes. By Walther Hofer. (Muenchen: R. Oldenbourg. 1950. Pp. 553.)Vom Historismus zur Soziologie. By Carlo Antoni. Translated by Walter Goetz. (Stuttgart: K. F. Koehler Verlag. 1950. Pp. 307.)Dogma and Wirklichkeitssinn in der Sowjetwirtschaft. By Adolf Weber. (Sitzungsberichte der Bayer. Akademie der Wissenschaften, Philos.-hist-orische Klasse. Jg. 1950. Heft 1. Pp. 52.)Anthologie politique. By Adrien Favre. (Paris: J. Peyronnet & Cie. 1950. Pp. 236.)