The _Correspondance inédite_ of Madame du Deffand with D'Alembert, Hénault, Montesquieu, and others was published in Paris (2 vols.) in 1809. _Letters of the marquise du Deffand to the Hon. Horace Walpole, afterwards earl of Orford, from the year 1766 to the year 1780_ (4 vols.), edited, with a biographical sketch, by Miss Mary Berry, were published in London from the originals at Strawberry Hill in 1810.
The standard edition of her letters is the _Correspondance complète de la marquise du Deffand ..._ by M. de Lescure (1865); the _Correspondance inédite_ with M. and Mme de Choiseul and others was edited in 1859 and again in 1866 by the marquis de Ste-Aulaire. Other papers of Madame du Deffand obtained at the breaking up of Walpole's collection are in private hands. Madame du Deffand returned many of Walpole's letters at his request, and subsequently destroyed those which she received from him. Those in his possession appear to have been destroyed after his death by Miss Berry, who printed fragments from them as footnotes to the edition of 1810. The correspondence between Walpole and Madame du Deffand thus remains one-sided, but seven of Walpole's letters to her are printed for the first time in the edition (1903) of his correspondence by Mrs Paget Toynbee, who discovered a quantity of her unedited letters. See Sainte-Beuve, _Causeries du lundi_, vols. i. and xiv.; and the notice by M. de Lescure in his edition of the correspondence.
DEFIANCE, a city and the county seat of Defiance county, Ohio, U.S.A., at the confluence of the Auglaize and Tiffin rivers with the Maumee, about 50 m. S.W. of Toledo. Pop. (1890) 7694; (1900) 7579 (960 foreign-born); (1910) 7327. It is served by the Baltimore & Ohio and the Wabash railways, and by the Ohio Electric railway to Lima (42 m.). The city commands a fine view of the rivers and the surrounding country, which is well adapted to agriculture; and has large machine shops and several flour mills, besides manufactories of agricultural implements, waggons, sashes and blinds, and wood-working machinery for the manufacture of artillery wheels. Here, too, is Defiance College, an institution of the Christian Denomination, opened in 1885. Defiance was long the site of an Indian village. In 1794 General Anthony Wayne built a fort here and named it Defiance. In 1822 Defiance was laid out as a town; in 1845 it was made the county seat of the newly erected county; and in 1881 it became a city of the second class.