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[[pre-printed]]Bureaus of Administration. Agriculture.

International Exhibition.
1876.

United States Centennial Commission.

Philadelphia [[/pre-printed]] Mar 17 [[pre-printed]] 187 [[/pre-printed]] 6

[[annotation]]228
Oct. 2. 75 [[?]] [[/annotation]]

Prof. Spencer F. Baird
U.S. Fish Commissioner
Washington D.C.
Sir: -
Permit me to ask your opinion as to the propriety of using in our aquaria, the same fresh water continuously without filtration - 

We had decided to erect costly tanks for filtration but have had our attention drawn to the arrangements in use at Manchester - Proper circulation and aeration will be provided and we only hesitate as to our course