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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