Turgot and Smith are said--on authority which cannot be altogether disregarded, Condorcet, the biographer of Turgot--to have continued their economic discussions by correspondence after Smith returned to this country; but though every search has been made for this correspondence, as Dugald Stewart informs us, no trace of anything of the kind was ever discovered on either side of the Channel, and Smith's friends never heard him allude to such a thing. "It is scarcely to be supposed," says Stewart, "that Mr. Smith would destroy the letters of such a correspondent as M. Turgot, and still less probable that such an intercourse was carried on between them without the knowledge of Mr. Smith's friends. From some inquiries that have been made at Paris by a gentleman of this society[165] since Smith's death, I have reason to believe that no evidence of the correspondence exists among the papers of M. Turgot, and that the whole story has taken its rise from a report suggested by the knowledge of their former intimacy."[166] Some of Hume's letters to Turgot--one from this year 1766, combating among other things Turgot's principle of the single tax on the net product of the land--still exist among the Turgot family archives, but none from Smith, for Leon Say examined those archives a few years ago with this purpose among others expressly in view. An occasional letter, however, certainly did pass between them, for, as Smith himself mentions in a letter which will appear in a subsequent chapter, it was "by the particular favour of M. Turgot" that he received the copy of the _Memoires concernant les Impositions_, which he quotes so often in the _Wealth of Nations_. This book was not printed when he was in France, and as it needed much influence to get a copy of it, his was most probably got after Turgot became Controller-General of the Finances in 1774. But in any case it would involve the exchange of letters. Smith, with all his admiration for Turgot, thought him too simple-hearted for a practical statesman, too prone, as noble natures often are, to underrate the selfishness, stupidity, and prejudice that prevail in the world and resist the course of just and rational reform. He described Turgot to Samuel Rogers as an excellent person, very honest and well-meaning, but so unacquainted with the world and human nature that it was a maxim with him, as he had himself told David Hume, that whatever is right may be done.[167]