The line from John Muir's The Calypso Borealis that shows an example of dialect is the last one:
"Mony a puir body has been lost in that muckle, cauld, dreary bog and never been found."
Let's remember that a dialect is a form of the language that is spoken in a particular part of a country or by a particular group of people. There are many of them in the English language and they have different words and grammar.