But, on the other hand, there were the leaves. Mrs. Darling examined them very carefully; they were skeleton leaves, but she was sure they did not come from any tree that grew in England. She crawled about the floor, peering at it with a candle for marks of a strange foot. She rattled the poker up the chimney and tapped the walls. She let down a tape from the window to the pavement, and it was a sheer drop of thirty feet, without so much as a spout to climb up by.