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Features

Rubber as a Colloid

Remarks upon the Chemical Structure of the Material in Various States

By D. F. Twiss

Substitute for Rubber-Insulated Wires

Tests for Trainmen in Germany

The Shell Builders—I

A Brief Introduction to the Study of Conchology

By R. W. Shufeldt

The Motor Fuel Problem

Electric Melting of Brass

Growing Hops in California

A Glimpse at an Industry That Will be Hit by Prohibition

By Arthur L. Dahl

The Century Plant in Mexico

The Sir Robert Hadfield Prize

At Pompeii and St. Pierre

The Dynamic Heating of Air as a Cause of Hot Volcanic Blasts

By George W. Cole

Direct Current vs. Power Factor

A Study in Inductance and What It means to the Engine

By F. E. Austin

German Mining Operations in Serbia

Vulcanisation of Rubber at Constant and Increasing Temperatures

Influence of Aluminum Ions on Seed Germination

Experiments upon the Relation between Electric Conductibility and the Germination of Plants

By Julius Stoklasa

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