These people never saw the sunset in winter, and the curious majesty of factories against the glow; they never saw the lights upon the mud; they did not love the barges and the tugs, sliding up with a squat importance out of the fog, or swishing lazily down in the early morning, with the hoarfrost thick upon their decks. They did not know what the river was like in the darkness or the winter dusk; you could not know that till you had been on the river many times at those hours and found out the strange lights and the strange whispers, and the friendly loneliness of the river in the dark.