"How fast have we been going?"

"Well, you heard what the professor said when he was raging round.
Sometimes, he said, we was making fifty miles an hour, sometimes ninety,
sometimes a hundred; said that with a gale to help he could make three
hundred any time, and said if he wanted the gale, and wanted it blowing
the right direction, he only had to go up higher or down lower to find
it."

"Well, then, it's just as I reckoned. The professor lied."

"Why?"

"Because if we was going so fast we ought to be past Illinois, oughtn't
we?"

"Certainly."

"Well, we ain't."

"What's the reason we ain't?"

"I know by the color. We're right over Illinois yet. And you can see for
yourself that Indiana ain't in sight."

"I wonder what's the matter with you, Huck. You know by the COLOR?"

"Yes, of course I do."