A Connecticut Yankee in King Arthur's Court, Part 3.
After I had finished, I got him to lend me a little ink from his veins; and with this and a sliver I wrote on a piece of bark--     Put him in the Man-factory--  and gave it to him, and said:  "Take it to the palace at Camelot and give it into the hands of Amyas le Poulet, whom I call Clarence, and he will understand."