“No,” said Piglet quickly. “He couldn’t.”

Owl explained about the Necessary Dorsal Muscles. He had explained this to Pooh and Christopher Robin once before, and had been waiting ever since for a chance to do it again, because it is a thing which you can easily explain twice before anybody knows what you are talking about.

“Because you see, Owl, if we could get Piglet into the letterbox, he might squeeze through the place where the letters come, and climb down the tree and run for help.”