"Pison" is dialect for "poison"--and poison here meaning pretty much "very." In a colloquial sense... you could almost say "damn" instead, and I think Twain might have been aiming for something strong like that. I suspect three-day draft means a bank draft that is post-dated for three days later, which is obviously a scam. But maybe somebody else has a more definitive answer. Hope that helps, and good luck with the translation! John Bird Winthrop University