It fell open, and out came the Hippogriff.

Then they saw something struggling under the next page and lifted it, and out came a megatherium.

So they shut the book and built it into the wall again.' 'But how did the megawhatsitsname and the Hippogriff come to be the proper size ?' 'Ah! that's one of the eleven mysteries.

Some sages suppose that the country gave itself a sort of shake and everything settled down into the size it ought to be.

I think myself that it's the air.