At Rome he was "the Dean" of the diplomatic body, and on many occasions various representative duties fell upon him as such which were especially unwelcome to him.

The determination of the Great Powers to send ambassadors to the Court of the Quirinal instead of ministers plenipotentiary, as previously, came as a great boon to Mr.Marsh.For as the United States send no ambassadors, his position as longest in office of all the diplomatic body no longer placed him at the head of it.
Mr.Marsh was a man of very large and varied culture.

A thorough classical scholar and excellent modern linguist, philology was perhaps his most favourite pursuit.

He wrote various books, his best I think a very large octavo volume, entitled not very happily _Man in Nature_.
The subject of it is the modifications and alterations which this planet has undergone at the hands of man.

His subject leads him to consider much at large the denudation of mountains, which has caused and is causing such calamitous mischief in Italy and the south of France.