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Features

Forecasting the Seasons

A subject of great Importance in Connection with Planting and Growth of Crops

By Alexander McAdie

Electric Heating of Steam Boilers

The Internal Secretions

Chemical Factors in the Regulation of the Organism

By Percy G. Stiles

Engineering in the Great European War

Former Tactics and Strategy have become Subordinate Factors

By Frank W. Skinner

The Electrical Properties of Gases—III

Which Enable Important Problems in Physics to be Studied

By J. J. Thomson

True Greenheart is Not Poisonous

By C. D. Mell

Electric and Hydraulic Transmission

Rubber Exports from Straits Settlements

Gravitational Attractions

By F.H. Loring

The Unipolar Dynamo and its Future

A Simple and Efficient Type Possessing Great Possibilities

By Louis B. Lawrence

Achrodextrinase

Mechanical Testing of Cast Iron

New Device to Determine Hardness

Grain Size Measurements in Metals

The Importance of Such Information

By Zay Jeffries

Wire Drawing

By A.T. Adam

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July 28, 1917

Think Outside the Gift Box