CLEMENS, Samuel Langhorne ("Mark Twain", 1835-1910). Autograph letter signed ('S.L. Clemens') to Parke Godwin, Hartford, Connecticut, 5 November 1890, 'Of course I'm rather an awkward novice as yet, but wait till I get my hand in & I will show you a quantity of wickedness which will justify all the golden hopes which I perceive you have of me. Continue your encouragement -- I'll make you proud of me!', one page, 8vo, envelope. Provenance: by descent from the recipient.