Without appearing to suggest anything beyond a trifling blemish in this story, replete as it is with edifying illustrations of the frailties of human nature, it would be well to remember that the helmet shell (CASSIS FLAMMEA) is not nacreous and could not therefore produce a true pearl, but merely g porcellaneous concretion, which, however, might possess a most attractive tint, possibly pale salmon or orange. Such a gem might be valuable. Great pearls are not generally found on shallow reefs. He who would search for them systematically must dive, and if he does not possess the proper costume and accessories his trips below are but brief, and not always profitable. When a diver boasts that he can remain under water two or three minutes--and the boast is very common--he has gauged his endurance by his sensations, not by the clock. Once an expert was timed, a coloured gentleman who had great repute among his companions, all capable divers. He made a special and supreme effort, and though the watch recorded barely seventy seconds, he was much distressed. Recovery was, however, speedy; of ten subsequent minutes he spent more than half out of sight. It is not argued that human beings cannot remain voluntarily under water more than seventy seconds, but the feat is so rare that those who accomplish it are not usually pearl-divers. The natives of some parts of Borneo declare that the valves of the oysters containing the largest pearls are always open, and that by peering into the water the pearls may be seen. They tell a story of a gigantic pearl which was thus discovered by the men of old and actually brought while within the oyster into a canoe, but had slipped from the fingers of a careless holder into deep water.