To the materials derived from these sources, I have added some manuscripts of an important character from the library of the Escurial. These, which chiefly relate to the ancient institutions of Peru, formed part of the splendid collection of Lord Kingsborough, which has unfortunately shared the lot of most literary collections, and been dispersed, since the death of its noble author. For these I am indebted to that industrious bibliographer, Mr. O. Rich, now resident in London. Lastly, I must not omit to mention my obligations, in another way, to my friend Charles Folsom, Esq., the learned librarian of the Boston Athenaeum; whose minute acquaintance with the grammatical structure and the true idiom of our English tongue has enabled me to correct many inaccuracies into which I had fallen in the composition both of this and of my former works. From these different sources I have accumulated a large amount of manuscripts, of the most various character, and from the most authentic sources; royal grants and ordinances, instructions of the Court, letters of the Emperor to the great colonial officers, municipal records, personal diaries and memoranda, and a mass of private correspondence of the principal actors in this turbulent drama. Perhaps it was the turbulent state of the country which led to a more frequent correspondence between the government at home and the colonial officers. But, whatever be the cause, the collection of manuscript materials in reference to Peru is fuller and more complete than that which relates to Mexico; so that there is scarcely a nook or corner so obscure, in the path of the adventurer, that some light has not been thrown on it by the written correspondence of the period. The historian has rather had occasion to complain of the embarras des richesses; for, in the multiplicity of contradictory testimony, it is not always easy to detect the truth, as the multiplicity of cross-lights is apt to dazzle and bewilder the eye of the spectator.