The Ohio River; a course of empire,

I. Introductory: The River, its place and power.--II. Where France and England met.--III. The old French war in the West.--IV. One of the vanguard of the pioneers.--V. The "Monongahela country" and its metropolis.--VI. The Ohio in the revolution.--VII. The fighting Virginians.--VIII. Fort Washington and the "Bloody way."--IX. The reign of the rowdy and outlaw.--X. From keelboat to schooner.--XI. From Pittsburg to Louisville in 1806.--XII. Blennerhassett island.--XIII. Where Yankee and Virginian met.--XIV. When the steamboat was king.--XV. The workshop of the world.

Scientific papers : physics, chemistry, astronomy, geology /

The forces of matter. The chemical history of a candle. By M. Faraday--On the conservation of force. Ice and glaciers. By H. von Helmholtz--The wave theory of light. The tides. By Sir W. Thomson (Lord Kelvin)--The extent of the universe, by S. Newcomb--Geographical evolution, by Sir A. Geikie.