BUFFALO, Jan. 22, 1870. DEAR SIR,--Please do not publish the note I sent you the other day about “Hy. Slocum's” plagiarism entitled “Three Aces”--it is not important enough for such a long paragraph. Webb writes me that he has put in a paragraph about it, too--and I have requested him to suppress it. If you would simply state, in a line and a half under “Literary Notes,” that you mistook one “Hy. Slocum” (no, it was one “Carl Byng,” I perceive) “Carl Byng” for Mark Twain, and that it was the former who wrote the plagiarism entitled “Three Aces,” I think that would do a fair justice without any unseemly display. But it is hard to be accused of plagiarism--a crime I never have committed in my life. Yrs. Truly MARK TWAIN. But this came too late. Aldrich replied that he could not be prevented from doing him justice, as forty-two thousand copies of the first note, with the editor's apology duly appended, were already in press. He would withdraw his apology in the next number of Every Saturday, if Mark Twain said so. Mark Twain's response this time assumed the proportions of a letter. ***** To Thomas Bailey Aldrich, in Boston: 472 DELAWARE ST., BUFFALO, Jan. 28. DEAR MR. ALDRICH,--No indeed, don't take back the apology! Hang it, I don't want to abuse a man's civility merely because he gives me the chance. I hear a good deal about doing things on the “spur of the moment”--I invariably regret the things I do on the spur of the moment. That disclaimer of mine was a case in point. I am ashamed every time I think of my bursting out before an unconcerned public with that bombastic pow-wow about burning publishers' letters, and all that sort of imbecility, and about my not being an imitator, etc. Who would find out that I am a natural fool if I kept always cool and never let nature come to the surface? Nobody. But I did hate to be accused of plagiarizing Bret Harte, who trimmed and trained and schooled me patiently until he changed me from an awkward utterer of coarse grotesquenesses to a writer of paragraphs and chapters that have found a certain favor in the eyes of even some of the very decentest people in the land--and this grateful remembrance of mine ought to be worth its face, seeing that Bret broke our long friendship a year ago without any cause or provocation that I am aware of.