Childrens' book philosophy 7: Scientific hypothesis in "Wind in the Willows"

The Mole fell backwards on the snow from sheer surprise and delight. `Rat!' he cried in penitence, `you're a wonder! A real wonder, that's what you are. I see it all now! You argued it out, step by step, in that wise head of yours, from the very moment that I fell and cut my shin, and you looked at the cut, and at once your majestic mind said to itself, "Door-scraper!" And then you turned to and found the very door-scraper that done it! Did you stop there? No. Some people would have been quite satisfied; but not you. Your intellect went on working. "Let me only just find a door-mat," says you to yourself, "and my theory is proved!" And of course you found your door-mat. You're so clever, I believe you could find anything you liked. "Now," says you, "that door exists, as plain as if I saw it. There's nothing else remains to be done but to find it!" Well, I've read about that sort of thing in books, but I've never come across it before in real life.

From "The Wind in the Willows" by Kenneth Grahame