when david heard this story first he was quite certain that he had never tried to escape, but i told him to think back hard, pressing his hands to his temples, and when he had done this hard, and even harder, he distinctly remembered a youthful desire to return to the tree-tops, and with that memory came others, as that he had lain in bed planning to escape as soon as his mother was asleep, and how she had once caught him half-way up the chimney.