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Volcanic Action and Newly Recognized Types of Volcanoes

By E. H. L. Schwarz

Synthetic Tannin

Open Air Coal Mining

Stripping Methods Employed in the Anthracite Coal Region of Pennsylvania

By E. J. D. Coxe

Bird Calling

An Attractive art for Lovers of Nature

By W. A. Nicholson


Some Aspects of the Subject of Transportation

II.—Inland Waterways

By J. Kuhn

The New Seismology

Earthquake Study as a Branch of Physics

By J. Milne

The Industrial use of Synchronous Motors by Central Stations

Bettering Service by Co-operation between Producer and Consumer

By John C. Parker

The Present Appearance of some Temporary Stars

Preserving a Record for Future Observers

By E. E. Barnard

Heredity and Genius

By Charles Kassel

The Corona Method of Removing Smoke and Dust from Gasses

A Highly Efficient Form of Electrical Precipitation

By W. W. Strong

The Manufacture of Carbon Black from Natural Gas

Greatest user of Asbestos

The Twelfth International Congress of Geology

The Worlds Coal Supply the Principal Topic for Discussion

Our Debt to Pure Science

The Seat of the Soul

Views Held by Prominent Thinkers of the Past and Present

By David Fraser Harris

Sources of Motor Fuel

An Important Discussion at the British Motor Transportation Conference

Industrial Methods of Bending Wood


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