Among these papers, a variety of letters, chiefly from eminent foreigners, though interesting in themselves, were entitled to no place in the body of this work, as illustrative of the life and character of Hume. These I had intended to print in an appendix, believing that, though not directly connected with my own project, the lovers of literature would not readily excuse me for neglecting the opportunity afforded by my access to these papers, for adding to the stock of the letters of celebrated men. But the work, according to its original scope and design, continuing to increase under my hands, I found that if it contained the documents specially referred to in the text, its bulk would be sufficiently extended, and I have determined to let the other papers here alluded to follow in a separate volume, which will contain letters to Hume from D'Alembert, Turgot, Diderot, Helvétius, Franklin, Walpole, and other distinguished persons. The reader will find that many original documents printed in this collection have been obtained from other sources than the Hume papers. My acknowledgments are particularly due to the Earl of Minto, for the liberality with which he allowed me the uncontrolled use of the large and valuable collection of correspondence between Hume and Sir Gilbert Elliot. For the letters in the Kilravock collection I am indebted to Cosmo Innes, Esq., sheriff of Morayshire; and I obtained access to those addressed to Colonel Edmondstoune, through the polite intervention of George Dundas, Esq., sheriff of Selkirkshire. I am obliged to the kindness of Lord Murray for much assistance in obtaining materials and information for this work; and to Robert Chambers, Esq., who has been accustomed from time to time, to preserve such letters and other documents connected with Scottish biography, as came under his notice, I have to offer my thanks for the whole of his collections regarding Hume, which he generously transferred to me. In the use of printed books, where the Advocates' Library, to which I have professional access, has failed me, I have found the facilities for consulting the select and well arranged collection of the Writers to the Signet of great service. I owe acknowledgments to many friends for useful advice in the conduct of the work. To one especially, who, after having long occupied a distinguished place in the literature of his country, permits his friends still to enjoy the social exercise of those intellectual qualities that have delighted the world, I am indebted for such critical counsel as no other could have given, and few would have had the considerate kindness to bestow, were they able.