Davidson, P. G., Jr. "Whig Propagandists of the American Revolution," _American Historical Review_, XXXIX, 442-53 (April, 1934). (Also see _Revolutionary Propaganda in New England, New York, and Pennsylvania, 1763-1776_. Unpublished dissertation, University of Chicago, 1929.)
"Deism," in _The New Schaff-Herzog Encyclopedia of Religious Knowledge_, III, 391-7 (by Ernst Troeltsch).
De la Fontainerie, F., tr. and ed. _French Liberalism and Education in the Eighteenth Century: The Writings of La Chalotais, Turgot, Diderot, and Condorcet on National Education._ New York: 1932. (Convenient source book.)
Dewey, D. R. _Financial History of the United States._ New York: 1924 (9th ed.). (Bristles with bibliographical aids for study of eighteenth century.)
Draper, J. W. _Eighteenth Century English Aesthetics: A Bibliography._ Heidelberg: 1931. (Source materials, pp. 61-128, for aesthetics of literature and drama: includes in appendix, pp. 129-40, ablest secondary works to 1931. An invaluable guide. See additions by R. S. Crane, _Modern Philology_, XXIX, 251 ff. [1931], W. D. Templeman, _ibid._, XXX, 309-16, R. D. Havens, _Modern Language Notes_, XLVII, 118-20 [1932].)
Drennon, Herbert. "Newtonianism: Its Method, Theology, and Metaphysics," _Englische Studien_, LXVIII, 397-409 (1933-1934). (Other parts of Mr. Drennon's brilliant doctoral dissertation, _James Thomson and Newtonianism_ [University of Chicago, 1928], have been published in _Publications of the Modern Language Association_, XLIX, 71-80, March, 1934; in _Studies in Philology_, XXXI, 453-71, July, 1934; and in _Philological Quarterly_, XIV, 70-82, Jan., 1935.)
Ducros, Louis. _French Society in the Eighteenth Century._ Tr. from the French by W. de Geijer; with a Foreword by J. A. Higgs-Walker. London: 1927.
Duncan, C. S. _The New Science and English Literature in the Classical Period._ Menasha, Wis.: 1913. (Scholarly.)
Dunning, W. A. _A History of Political Theories from Luther to Montesquieu._ New York: 1905, and _A History of Political Theories from Rousseau to Spencer_. New York: 1920. (Standard works.)
Elton, Oliver. _The Augustan Age._ New York: 1899, and _A Survey of English Literature, 1730-1780_. 2 vols. London: 1928. (Acute on literary trends, though hardly adequate on ideas.)