Read this sentence from "the cask of amontillado" by edgar allan poe:

in painting and gemmary, fortunato, like his countrymen, was a quack, but in the matter of old wines he was sincere.

what does the word quack likely mean?

What is implied in this sentence from mark twain's "the £1,000,000 bank-note"? i was puzzled, and wanted to discuss the matter a little further, but they didn't; so i took my leave, feeling hurt and insulted to be made the butt of what was apparently some kind of a practical joke, and yet obliged to put up with it, not being in circumstances to resent affronts from rich and strong folk.