But it was the harbor, more than the town, that had made "The Merry Hearts" wonder and exclaim. Its opalescent waters sparkled and shimmered in the sunlight, showing every conceivable shade and tint of blue, green and purple. Patches of green so pale as to be almost white lay close to pools stained a rich, deep purple. Why was it? It could not be the effect of cloud shadows, for there was not a cloud in the sky.