Check the "Boston Evening Transcript" November 26, 1872 for a letter by
Clemens...but easier than that see: "British Benevolence" in
Charles Neider's _Life as I Find It_. This is the text of a letter
published in the New York Tribune, January 27, 1873  concerning the
incident  on  the Batavia in November of 1872.

I tracked this down via a reference in Dennis Welland's _Mark Twain
in England_ page 53.

Paul Berkowitz