Pearls: Pearl Fisheries of the British Isles Page 211



	168	THE BOOK OF THE PEARL

	tions, of which pearls are the result. There seems to exist no inherent cause why Anadon cygnea, with its beautiful silvery nacre—as bright often, and always more delicate, than that of Unio margaritiferus— should not be equally productive of pearls; but secure from violence in its still pools and lakes, and unexposed to the circumstances that provoke abnormal secretions, it does not produce a single pearl for every hundred that are ripened into value and beauty by the exposed, current-tossed Unionidae of our rapid mountain rivers. Would that hardship and suffering bore always in a creature of a greatly higher family similar results, and that the hard buffets dealt him by fortune in the rough stream of life could be transmitted, by some blessed internal pre-disposition of his nature, into pearls of great price."¹ The small blue mussel (Mytilus edulis) of the British seas yields opaque pearls of a deep blue color, but most of them are more or less white in some part. Sometimes a shell is found in which a blue pearl will be adhering to the blue lip of the shell while a dull white one adheres to the white portion of the shell. These pearls are commonly flattened on one side, doubtless where they have been adjacent to the shell. None of them is of more than very slight value. Probably the principal fishery for the salt-water mussel pearls is that in the estuary of the Conway in Wales. These are mostly quite small and well answer the designation of seed-pearls, although a few are of fair size. In color most of them range from dirty white to the dusky or brownish tint noted by Tacitus eighteen centuries ago, but a few are of a pure silvery tint. In some seasons London dealers have agents at Conway for purchasing these pearls. The price is usually from eight to thirty shillings per ounce.

	THE CONTINENT OF EUROPE Après l'esprit de discernement, ce qu'il y a au monde de plus rare, ce sont les diamants et les perles. La Bruyère, Les caractères. Pearls occur in species of mussels found in the streams and lakes of Europe, in some of which the fisheries have been of considerable local interest. It appears that these resources were exploited by the Romans, then by the Goths and the Lombards, and later the natives continued to draw forth the treasures which lay hidden about their ¹ Hugh Miller, "My Schools and Schoolmasters," 1852, p. 201.