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Recent Trial of the Lay Torpedo

The Pennsylvania Railway Passenger Station at the Exhibition Entrance

Opening of the International Exhibition

Gas Engines

The International Exhibition of 1876

Iron Assaying

By Bruno Kerl

New Oxide of Sulphur

John Fitch

New Steam Street-Car

Lawn Pavilion

French Academy of Sciences.—March

Science Notes

The French Exposition of 1878

Academy of Natural Sciences, Philadelphia, Pa

On the Preparation of Dextrine-Maltose (Malt Sugar) and its use in Brewing

By Wm. Geo. Valentine

The Mechanical Ventilation of Mines

Lessons in Mechanical Drawing

By MacCord

On Repulsion Resulting from Radiation

By William Crookes

Colors and their Effects upon the Human System

Retort-Settings

New Air Compressor

A Multi-Cylinder Engine

By William H. Billing

Piston Rods for Horizontal Engines

Unhealthy Trades

A Lecture before the Society of Arts, London

By B. W. Riciiardson

Paris Green

Action of Peroxide of Hydrogen upon Fatty Oils

By S. Cohne

Dr. Letheby

Analogy of Cyanogen to Oxygen

By Willim Skey

Mesmerism in Dentistry

Production of Methylaniline Violet Directly on Cotton

By Albert Dupuy

Antimony Photographs

Bar-Iron Pit-Guides

Improved Hydraulic Shears

Centrifugal Pump and Engine

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    Know Before You Vote