What metaphors are used in The Adventures of Tom Sawyer by Mark Twain?

Example of metaphor:

When a Sunday-school superintendent makes his customary little speech, a hymn-book in the hand is as necessary as is the inevitable sheet of music in the hand of a singer who stands forward on the platform and sings a solo at a concert—though why, is a mystery: for neither the hymn-book nor the sheet of music is ever referred to by the sufferer.

Twain metaphorically compares the minister's sermons to acts of showmanship..... meaning the minister seems more like an actor than a member of the clergy.