Ch 19-22 it is when Huck finds the two runaway men.
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They were running away from the townspeople. They actually didn't know each other before getting to the raft.The younger man reveals that he was selling a sort of toothpaste. Unfortunately it took the enamel off people’s teeth.
The older man held a temperance revival meeting for alcoholics until it was found out that he could drink anyone under the table.