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Lily of the Valley

The Great Equatorial of the Paris Observatory

Report on Insects

The Onion Maggot

The Breeds of Dogs

Restocking the Seine with Fish

Modern Armor

By F. R. Brainard

The New Compressed Air Station at Paris

The Builders of the Steam Engine— The Founders of Modern industries and Nations

By R. H. Thurston

Improved Hand Car

The Conic Sections

By C. W. MacCord

Table of Atomic Weight

The Tanning materials of Europe

An Apparatus for Heating Substances in Glass Tubes under Pressure

By H. Pemberton

Testing Cement


  • Departments

    Patents- May 23, 1891

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