“Uncle Bob has just returned from California,” said the boy named Billy, “and has brought Big Sister a necklace of very beautiful coral beads; not a bit like the dark red branchy looking ones that she has had since she was a baby! These are rose pink with little hand-carved roses all over them. What sort of a stone is coral, and where is it found? It’s lovely!” “Strictly speaking,” said Somebody, “although coral has all the appearance of stone it isn’t that at all, although it is just as dangerous to a ship to run aground on a reef of it as it would be to run on the rocks--it’s so jagged and sharp. It is really the bones you might say of living creatures which made their homes in that particular spot for ages and dying have left their skeletons behind them for a monument. “These little sea animals are called polyps and the coral grows inside their soft outer structure just as your bones do inside your flesh. Among the greatest architects in the world are the little coral-making animals, creatures of shallow water in the warmer seas. Some kinds live all alone, but the commoner ones live in colonies of many individuals united by a stalk with many branches--sort of a family tree you might say--indeed they were once called plant animals. They have a very helpful and economical way of living,” went on Somebody, “for when something good to eat swims or floats within reach of one little polyp’s mouth he sucks it in, swallows it, and all his hungry relatives get the benefit of it.” “That’s what I’d call being real chummy,” said the boy named Billy. “How do they manage that?” “They have a sort of family stomach,” said Somebody, “or reservoir into which all food absorbed by the colony goes.” “I don’t believe I’d like that very well,” said Billy. “One fellow might have to eat all the things he didn’t care about and another would get all the pie.” “I do not suppose the polyp has much to boast of in the way of the sense of taste,” laughed Somebody, “but you’ve got to admit that he does his duty as he sees it without shirking.” “I should say he does,” said Billy. “What else does he do besides working for the good of his family?” “He has a quite important hand in making the ‘beauteous land,’” said Somebody. “The Great Barrier Reef of Australia, extending a thousand miles along the coast and in some places from one to three miles wide, was made entirely by the Polyps. Also the keys of Florida, as well as the Everglades, are made entirely upon coral foundation.” “That is very interesting,” said the boy named Billy. “But if there is so much of it why is it so expensive?”