He used the collection known as the "Pickett Papers," for official despatches, supplementing these when gaps occurred by a study of the _Mason Papers_, but his work, narrative in form, permits no extended printing of documents.

(4) L.M.
Sears, _A Confederate Diplomat at the Court of Napoleon III_.

(Am.

Hist.
Rev.Jan., 1921), is a study drawn from Slidell's private letters in the _Mason Papers_.

The Mason Papers exist in eight folios or packages in the Manuscript Division of the Library of Congress, and in addition there is one bound volume of Mason's despatches to Richmond.