rent good liealtli . It was necessary to move these fishes once 

 or twice, in order to comj^lete the ponds in wliich they were 

 pLaced, and during the necessary handling in their transfer 

 they became somewhat bruised, and in some instances they 

 were attacked by the Bj^ssus, the spores seeming to attach 

 themselves readily to any bruised place,, and once getting 

 established, this plant would grow rapidly, and finally 

 cause the death of the fish on which it fixed itself. 



It is our desire to extend and multiply these ponds con- 

 siderably, so that we will be able to keep a large number 

 and a variety of the fish propagated in the Hatching House. 



CENTENNIAL EXHIBITION. 



Messrs. John H. B. Latrobe and Samuel M. Shoemaker, 

 Commissioners, representing the State of Maryland at the 

 International Exhibition in Philadelphia, having requested 

 us to co-operate with them in their representation of the re- 

 sources and industries of the State, we cheerfully undertook 

 to bring together as full a collection of the food products of 

 the Chesapeake Bay, and its tributaries, as the limited time 

 would admit. 



Through the assistance of the Maryland xicademy of 

 Sciences, who were organized as a corps of trained collectors, 

 we were able to exhibit a pretty full series, in alcohol, of the 

 fishes found in our water, as well as several series of oysters 

 taken from the important beds of the Chesapeake. These 

 latter were peculiaily interesting, as showing the modifica- 

 tions of form, and position of growth to the current, as 

 caused by the difi'erent surroundings, depth of water, etc. 



We also illustrated, by a series of models, the methods 

 and appliances used in the culture of fish, and the imple- 

 ments and boats used in the capture of fish and oysters, as 

 peculiar to our waters. 



The model of the Druid Hill Hatching House was very 

 complete in detail. During the breeding season of the 



