These contain the private correspondence of Mason and Slidell while in Europe.
Slidell's letters are originals.

Mason's letters are copies in Slidell's hand-writing, made apparently at Mason's request and sent to him in May, 1865.

A complete typed copy of this correspondence was taken by me in 1913, but this has not hitherto been used save in a manuscript Master's degree thesis by Walter M.Case, "James M.Mason, Confederate Diplomat," Stanford University, 1915, and for a few citations by C.F.Adams, _A Crisis in Downing Street_ (Mass.Hist.Soc._Proceedings_, May, 1914).
The Mason Papers also contain many letters from Mason's English friends, Spence, Lindsay, Gregory and others.] [Footnote 551: Russell Papers.

To Russell.

Lyons thought France also included in these demonstrations.] [Footnote 552: _A Cycle of Adams' Letters_, I, 113.