The wheel was standing idle, and the children went down the slippery steps to the pool below. It was cool and dark there, for the trees grew low over the stream, and the water, escaping from the race above, poured down by the side of the wheel in a foaming cataract. A dipper was hopping about from stone to stone in the centre of the stream, pruning her sleek feathers, and calling her lively 'chit, chit' to her mate. Peggy grasped Bobby by the arm.