The Adventures of Tom Sawyer by Mark Twain Chapter 14 Page 11

Yes, and they take loaves of bread and put quicksilver in ’em and set ’em afloat, and wherever there’s anybody that’s drownded, they’ll float right there and stop.”

“Yes, I’ve heard about that,” said Joe. “I wonder what makes the bread do that.”

“Oh, it ain’t the bread, so much,” said Tom; “I reckon it’s mostly what they say over it before they start it out.”

“But they don’t say anything over it,” said Huck. “I’ve seen ’em and they don’t.”

“Well, that’s funny,” said Tom. “But maybe they say it to themselves. Of course they do. Anybody might know that.”