There was little time to waste. The Box was beginning to glow and shiver. Unthahorsten stared around wildly, fled into the next gossatch, and groped in a storage bin there. He came up with an armful of peculiar-looking stuff. Uh-huh. Some of the discarded toys of his son Snowen, which the boy had brought with him when he had passed over from Earth, after mastering the necessary technique. Well, Snowen needed this junk no longer. He was conditioned, and put away childish things. Besides, though Unthahorsten's wife kept the toys for sentimental reasons, the experiment was more important.
Unthahorsten left the glossatch and dumped the assortment into the Box, slamming the cover shut just before the warning signal flashed. The Box went away.

Mimsy Were The Borogoves (1943)