Polly says it was by magic, and when Digory agrees she figures that they've not a magician, but has traveled on another's magic.
It was at this point in their young life's that they took far more prolonged fixation on s (uppers, prellys) or a German made pills called "Preluden. https://Bookmark-Dofollow.com/story20569691/daha-fazla-bilgiml