Lord Curzon, then Foreign Secretary, graciously approved the request but with the usual condition that my manuscript be submitted before publication to the Foreign Office.

This has now been done, and no single citation censored.

Before this work will have appeared the limitation hitherto imposed on diplomatic correspondence will have been removed, and the date for open research have been advanced beyond 1865, the end of the Civil War.
Similar explanations of my purpose and proposed work were made through my friend Mr.Francis W.Hirst to the owners of various private papers, and prompt approval given.

In 1924 I came to England for further study of some of these private papers.

The Russell Papers, transmitted to the Public Record Office in 1914 and there preserved, were used through the courtesy of the Executors of the late Hon.