The noise grew louder and louder, so that it resembled the squealing of a kitten, and all four began to turn over the moss with eager fingers, till, with a cry, Archie drew out a small round ball of dried grass, about the size of Bobby's fist, from which issued such crescendo squeaks that there could be no mistake as to the locality of the sound. The little ball was so beautifully made and so neatly rounded that there was not the slightest aperture to be seen, and Archie turned it over and over in his hand in some perplexity.