Abstract
There are few cases, probably, in which an animal parasite is itself an article of commerce. The large demand for mother of pearl in the industries has led to the artificial propagation of the fresh-water mussel, remarkable for its parasitic larval development. Although the parasitic stage is of comparatively short duration, it is an essential step in the life history. A thorough understanding of this as well as of other stages has been a prerequisite for successful propagation.t The whole problem of mussel propagation has proved more complex than it was at first supposed to be. In early attempts (Lefevre and Curtis. 1912) at artificial infections of fish with the glochidia of mussels a susceptibility of certain groups was recognized, but the relation of one mussel as a specific parasite of a given fish or group of species was not recognized. The acquirement of this information made possible the propagation of more species of mussels, among them some of the most valuable commercial varieties. Another barrier to success was the
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