So Barty trotted along and the Good Wolf trotted with him. The bird with the blue crest flew before them and Barty was quite sure it was showing them the way somewhere, because every now and then it stopped and perched on a bough and sang its little song. They went up the hill and up and up until they came to a place where they suddenly found themselves on the edge of a green hollow, and the minute they saw it the Good Wolf cried out, "_There's_ something we want," and trotted down as fast as he could to a big, clear pool which lay at the bottom of the hollow, and began to lap quickly.