Old Mr. Toad in "A Shadow Passes Over The Smiling Pool"

It was so peaceful and beautiful there that it didn't seem possible that danger of any kind could be lurking near. But Old Mr. Toad, swelling out that queer music bag in his throat and singing with all his might, never once forgot that wise saying of his, and so he was the first to see what looked like nothing so much as a little detached bit of the blackness of the Green Forest floating out towards the Smiling Pool. Instantly he stopped singing. Now that was a signal.