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The Cost of Coal

A Summary of the Various Elements Which Determine It

By Geo Otis Smith and C. E. Lesher

Anomalies in the Animal World—Part VI

The Origin of Vertebrate Animals We Call Birds

By R. W. Shufeldt

Differential Dilatometer

Time Zones at Sea

A Cycle in Naval Architecture

Saving Steel in Ships


The First Ferro-Concrete Ship

Odors Emitted by Bees

Let's Eat Fish

Mission Grapes in Ireland

Eye Protection and Sight Filters

The Tungsten Deposits of Southern Rhodesia

A Note on a Possible Explanation of Erratic Jumps in Clock Rates

By A. Conrad

On the Qualitative Separation and Detection of Gallium

By Philip E. Browning and Lyman E. Porter

The Origin of the Thermionic Vacuum Tube

Now Used in Radio Communication and the Electrical Arts

By Philip E. Edelman

The Experiences of an Iron Atom—I

The Cycle of Its Life History

By Charles R. Sturdevant


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