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Features

Central Africa

By John O. Means

The Efficiency of Screw Propellers

Heathorn's Steering Gear

Bricklaying in France

Fire-Brick and Terra Cotta

By Andrew McLean Parker

Improved Tanning Process

Comparative View of American Progress

Printing Receipts

An Attempt at a Systematic Classification of the Various Forms of Energy

By O. J. Lodge

Coret's Metallic Thermometers

Breaking Horses by Electricity

Reynier's New Incandescent Electric Lamp

Aspergillus in the Living Human Ear

By Charles Henry Burnett

Electric Illumination

By M. Tommasi

Determination of Potassa and Soda in Minerals

By W. Knop and J. Hazard

Horticultural Notes

Test for Traces of Mercury

By Ed. Teuber

Ferric Hydrates

By D. Tommasi

Active Matter of Malt, or Maltin and Diastase

By M. Dubrunfaut

How to Grow Tuberoses

The Great Glacier of Eastern America

A Remarkable Cave in Brazil

Pliocene Man

By Charles C. Abbott

Geodes

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    December 27, 1879

    Confronting Common Wisdom