They slid away from the little jetty, and turned up the arm of the lake. It was like a river pushing itself in among the hills.  Near its outlet it was wide, and on stormy days there was a choppy sea at its mouth; but as it wound its sinuous course inland it grew smooth and tranquil and even narrower, save that now and then at a sudden turn it broadened into a deep and quiet pool.  Then it would wind away again, each time seeming the last, until at length it narrowed to nothing, and the blue water vanished in a tangle of driftwood and rubbish brought by the slow tide to the end of its tortuous journey.