II.--MECHANICS AND ENGINEERING. Chard's Lubricene and Cups. The Electric Light and the Gas Companies. Fuel Gas. New Ways to Use Iron Wanted. Progress and Prospects of the East River Bridge. Two engravings. A Steam Tricycle. New Artesian Well, Victoria, Spain. A Long Train. How a Good House Should be Built. Jetties Under Water. How the Capitol at Albany, N. Y., is to be Warmed and Ventilated. What a Perfect Railway Brake Should do. The Secret of It. Florida Ship Canal. The Torpedo Vessel Destroyer. One illustration. Steam from Petroleum. The Motion of a Wagon Wheel. Building in Steel. Locomotive for the Metropolitan Elevated Railway. One illustration. The French Dam Below Pittsburg, Ohio. The Adelphi Explosion. "Forney" Locomotive for the New York Elevated Railway. One large engraving. The Steam Value of Oil Fuels. The Mechanical and other Properties of Iron and Mild Steel. French Wheelbarrows. Twenty-five engravings. Small Steamboats. Life Preservers. A Gas Clock. Another Mountain Railway. Preservation of Iron. The Salisbury Furnace for Petroleum. Danger from Lubricating Oils. The Testing of Boiler Iron. Tramway Rail Experiments. Two engravings. Aluminum and Platinum in the Manufacture of Watches. Great Machine Tool Makers. Gas as a Substitute for Solid Fuel. III.--MINING AND METALLURGY. The Formation of Quartz. Depth of Nevada Gold and Silver Mines. California Mining vs. Farming. New Form of Iron Manufacture. Comstock Silver Lodes. IV.--CHEMISTRY AND PHYSICS. Dangers from Impure Potassium Iodide. The Poplar as a Lightning Conductor. The Mariner's Compass. Crude Sulphur from Iron Pyrites. Antimony for Batteries. Delicate Test for Water. The Polarization of Electrodes. Fragarine. Balata Gum. Astronomical Notes. Giving the Positions, Rising, and Setting of the Planets for November. Professor Morton on the Electric Light. The Electrical Department in the Mechanic's Fair, Boston. The Satellites of Mars. Gold Amalgams. Another New Electric Light. Albumen of the Serum and that of Egg, and their Combinations. A Mirror Telegraph. Some Modifications of the Microphone and Telephone. Four engravings. A Chance for Electric Competition. Advantages of Experimental Study. The Black Spot of Jupiter. The Electric Light. With five engravings. Spontaneous Combustion. Recent Military Balloon Experiments. Burner for Electric Light. One engraving. Artificial Ball Lightning. One engraving. To Make Corks Air-tight and Water-tight. Electric Time Service for New York. Four engravings. The Hosmer Motor. Polarized Light. Phosphorescent Timepieces. The De Meritens Magneto-electric Machine. Two figures. Cellulose as a Material for Washers. V.--NATURAL HISTORY, NATURE, MAN, ETC.