"Honest injun, now, hain't you been telling me a lot of lies?"
"Honest injun," says I.
"None of it at all?"
"None of it at all. Not a lie in it," says I.
"Lay your hand on this book and say it."
I see it warn't nothing but a dictionary, so I laid my hand on it and said it.
What does the following conversation with Joanna from Chapter 26 suggest about Huck's continued moral development?