They went on and on, winding and twisting through the forest, which grew thicker and thicker. Often it seemed certain that they had come to the end, as they entered a pool with no apparent outlet; but, as they glided farther, the water opened before them in another bend, and yet another, and another.  Deep fern gullies came down to the water’s edge, dark and beautiful, and full of the chiming of bell-birds: and sometimes they heard the quick swish and crack of the stockwhip bird. They landed in one gully, where ’Possum said she had twice seen lyre-birds: and by great good luck, and patiently sitting on a log for twenty minutes, they actually caught a glimpse of a pair of the queer, shy birds, dancing solemnly on a mound, uttering strange sounds.