In the Senate of the United States. Letter from the Secretary of War, in response to the Senate resolution of March 1, 1894, inclosing a letter from the Chief of Engineers, with inclosures, relative to the feasibility and advisability of using the water power of the Great Falls of the Potomac or other water power in the neighborhood of Washington, D. C., for the purpose of lighting by electricity the public buildings, grounds, and streets of the District of Columbia, etc.