I have the source for Harry Langhorne's quote from Mark Twain as to his middle name of "Langhorne". I am holding in my hand Reminiscences by Rev. W. H. Langhorne, M. A.,Cantab. printed for the author and sold by David Douglas, 10 Castle Street and SIMPSON, MARSHALL, HAMILTON KENT & CO. Ltd., London 1893. In the Preface on page xiii I found the following charming anecdote: "Mark Twain was believed in our family to be in some way connected, but not knowing where he was to be found, I wrote to him, addressing my letter simply, 'Mark Twain, U.S.A.' This was on the 26th of July. On August 18th, that is, three weeks later, I received his reply dated 'Bad, Nauheim, Germany,' of which the subjoined is a copy. 'I was named Langhorne from a valued friend of my father, but he was not a relative, but a comrade of my father's youth in Virginia. I merely served by my name as a remembrance of that loved and lost comradeship of a vanquished day. Yours sincerely, S. Langhorne Clemens.' Let those who decry the Post Office make a note of thisincident." Chapter 7 (pages 75 to 95} of this book titled "Some Account of the Langhorne Family, especially of the Poet" is very interesting as there was an active correspondence between him and Mrs. Langhorne Appleton in America on family history which this chapter explores. Chiswell D. Langhorne, Jr.