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World Wide Changes of Temperature

Can Seasonal Forecasts be made from a Study of the Weather of the World?

By Charles F. Brooks

French Legislation upon Hydraulic Plants

Harnessing a Volcano to a 15,000-Horse-Power Electric-Power House

Indoor Telephotography

A Novel use of Okra

The Cohune Palm

A Central American Tree, the Nuts of which Produce a Valuable Oil

By C. D. Mell

Lag in U. S. Naval Radio Time Signals

The Laundries of the Ancients

By Henri Rousset

Origin and Culture of the Navel Orange

Importance of the Relation of Solid Surfaces and Liquid Films in some Types of Engineering Construction

By Clifford Richardson

Hard Rubber Sponge

The Hippocampus

Passive State of Metals

German Aeroplanes in the War

New Work for Women Created by the War

Measure of Atmospheric Pressure

The Training of the Analyst

By Frank Browne

The Contamination of Running Water with Tubercle Bacilli

A New Horned Snake

The Influence of some Elements on the Mechanical Properties of Steel

Geared Turbines

Boiler Efficiency

Transfer of Heat to the Plates

The Value of High-Level Meteorological Data—I

In Forecasting Changes of Temperature

By S. P. Fergusson

Modifications in the Dilatability of “Invar” Produced by Mechanical and Thermal Treatment

Weighing Apparatus in Industrial Plants

Suggestions for the Selection and Maintenance

By Fritz Reichmann

Linking up Electric Supply Lines

Physical Geography of the Southern Algerian-Moroccan Frontier

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    March 31, 1917

    Think Outside the Gift Box