He had carried Tinker Bell part of the way, and his hand was still messy with the fairy dust.
"Tinker Bell," he called softly, after making sure that the children were asleep, "Tink, where are you ?" She was in a jug for the moment, and liking it extremely; she had never been in a jug before.
"Oh, do come out of that jug, and tell me, do you know where they put my shadow ?" The loveliest tinkle as of golden bells answered him.

It is the fairy language.

You ordinary children can never hear it, but if you were to hear it you would know that you had heard it once before.
Tink said that the shadow was in the big box.

She meant the chest of drawers, and Peter jumped at the drawers, scattering their contents to the floor with both hands, as kings toss ha'pence to the crowd.

In a moment he had recovered his shadow, and in his delight he forgot that he had shut Tinker Bell up in the drawer.
If he thought at all, but I don't believe he ever thought, it was that he and his shadow, when brought near each other, would join like drops of water, and when they did not he was appalled.