Baron d'Holbach : a Study of Eighteenth Century Radicalism in France

Submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy, in the Faculty of Political Science, Columbia University New York 1914
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A une extréme justesse d'esprit il joignait une simplicité de moeurs tout-à-fait antique et patriarcale. J. A. Naigeon, Journal de Paris , le 9 fev. 1789
Diderot, writing to the Princess Dashkoff in 1771, thus analysed the spirit of his century:
The following study proposes to deal with this attack on religion that preceded and helped to prepare the French Revolution. Similar phenomena are by no means rare in the annals of history; eighteenth-century atheism, however, is of especial interest, standing as it does at the end of a long period of theological and ecclesiastical disintegration and prophesying a reconstruction of society on a purely rational and naturalistic basis. The anti-theistic movement has been so obscured by the less thoroughgoing tendency of deism and by subsequent romanticism that the real issue in the eighteenth century has been largely lost from view. Hence it has seemed fit to center this study about the man who stated the situation with the most unmistakable and uncompromising clearness, and who still occupies a unique though obscure position in the history of thought.
The sources are in a sense full and reliable for certain phases of his life and literary activity. His own publications, numbering about fifty, form the most important body of source material for the history and development of his ideas. Next in importance are contemporary memoirs and letters including those of Voltaire, Rousseau, Diderot, Grimm, Morellet, Marmontel, Mme. d'Epinay, Naigeon, Garat, Galiani, Hume, Garrick, Wilkes, Romilly and others; and scattered letters by Holbach himself, largely to his English friends. In addition there is a large body of contemporary hostile criticism of his books, by Voltaire, Frederick II, Castillon, Holland, La Harpe, Delisle de Sales and a host of outraged ecclesiastics, so that one is well informed in regard to the scandal that his books caused at the time. Out of these materials and other scattered documents and notices it is possible to reconstruct—though somewhat defectively—the figure of a man who played an important rôle in his own day; but whose name has long since lost its significance—even in the ears of scholars. It is at the suggestion of Professor James Harvey Robinson that this reconstruction has been made. If it shall prove of any interest or value he must be credited with the initiation of the idea as well as constant aid in its realization. For rendering possible the necessary investigations, recognition is due to the administration and officers of the Bibliothèque Nationale, the British Museum, the Library of Congress, the Libraries of Columbia and Harvard Universities, Union and Andover Theological Seminaries, and the Public Libraries of Boston and New York.