Pooh sat on the floor which had once been a wall, and gazed up at the ceiling which had once been another wall, with a front door in it which had once been a front door, and tried to give his mind to it.
"Could you fly up to the letter-box with Piglet on your back?" he asked.
"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 letter-box, he might squeeze through the place where the letters come, and climb down the tree and run for help."
Piglet said hurriedly that he had been getting bigger lately, and couldn't possibly, much as he would like to, and Owl said that he had had his letter-box made bigger lately in case he got bigger letters, so perhaps Piglet might, and Piglet said, "But you said the necessary you-know-whats wouldn't," and Owl said, "No, they won't, so it's no good thinking about it," and Piglet said "Then we'd better think of something else," and began to at once.
But Pooh's mind had gone back to the day when he had saved Piglet from the flood, and everybody had admired him so much; and as that didn't often happen he thought he would like it to happen again. And suddenly, just as it had come before, an idea came to him.
"Owl," said Pooh, "I have thought of something."
"Astute and Helpful Bear," said Owl.
Pooh looked proud at being called a stout and helpful bear, and said modestly that he just happened to think of it. You tied a piece of string to Piglet, and you flew up to the letter-box with the other end in your beak, and you pushed it through the wire and brought it down to the floor, and you and Pooh pulled hard at this end, and Piglet went slowly up at the other end. And there you were.