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By Alfred R. Wallace

Metamorphosis of the Deer's Antlers

Silk-Producing Bombyces and other Lepidoptera Reared in 1881

By Alfred Wailly

Mosquito Oil

The Cathedral of Burgos

The Panama Canal

By Manuel Eissler

Improved Averaging Machine

Compound Beam Engine

Power Hammers with Movable Fulcrum

By Daniel Longworth

The Bicheroux System of Furnaces Applied to the Puddling of Iron

Gessner's Continuous Cloth-Pressing Machine

Novelties in Ring Spindles

Improvements in Woolen Carding Engines


By W. Mattieu Williams

Photo-Engraving on Zinc or Copper

By Leon Vidal

Meridian Line

Action of Magnets upon the Voltaic Arc

Volckmar's Secondary Batteries

The Mineralogical Localities in and around New York City, and the Minerals Occurring Therein

By Nelson H. Darton


Crystallization and its Effects upon Iron

By N. B. Wood


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