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Radium and Radio-Activity—I

A Consideration of Some of the Physical and Chemical Aspects

By Charles H. Viol

Artificial Stone from Mica and Clay

Scattering of Light by Air Molecules

Social wasps and their Ways

Some Interesting Facts about These Familiar Insects

By Harold Bastin

The Nitrogen Content of Oxidized Coals

Behavior of Crystals in Liquid Air

Effect of Pressure Variation in forming Dust-pressed Tiles

Spark Gaps

Suggestions Concerning the Construction and Use of the Plugs

The Colloidal Membrane

Its Properties and its Function in the osmotic System

By Frank Tinker

Tree Surgery

How Monarchs of the Forest Are Preserved Beyond Their Natural Life Spans

By F. A. Bartlett

Production in the Sea

Tabanuco Gum or Porto Rican Elemi

The Influence of Colorson Butterflies

Balanced Rations from Restricted Sources

Their Physiological Effect on Growth and Reproduction

By E. B. Hart, E. V. McCollum, H. Steenbock and G. C. Humphrey

Disinfection by Heat

Experiments with Tandem Planes

The Langley and Eiffel Models, and a New Design

By Robert Gilbert Ecob

European Apple Beverages

Polishing Glass

The Origin of Comets

The Biological Character of Fatigue

How the Body Protects Itself against Excessive Weariness

Role of Ultra-Violet Light in Chemical Reaction


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