Photograph and copyright by Keystone View Co. 



UNLOADING OYSTERS FROM THE HOLD OE A CHESAPEAKE BAY SCHOONER: BALTIMORE 



Chesapeake Bay is the leading oyster ground of the world, producing about one-third of the 

 American product, while Baltimore is its foremost oyster market 



of the supply of raw materials on which 

 the business depends. A great laboratory 

 has been established on the Mississippi 

 River, at Fairport, in Iowa, and pioneer 

 studies and experiments have there been 

 in progress to determine how the pearly 

 mussels may be artificially increased, so 

 that the many factories making buttons 

 therefrom may not have to shut down 

 following the exhaustion of the mussel 

 beds bv unregulated fishing - . 



An entirely new problem in aquiculture 

 was here presented, and has now been 

 satisfactorily solved through the discov- 

 ery of the fact that the young mussels, 

 while still in a microscopic larval stage, 

 must attach themselves to the gills of par- 

 ticular fishes in order to develop, and 

 that unless the fishes for which the dif- 

 ferent kinds of mussels have a selective 

 affinity are available none of the young 

 will survive. 



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