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Possible Sources of Potash in America

With Notes on Methods of Recovery

By Frank K. Cameron

Grafting Bone and Skin in French Hospitals

By Francis P. Mann

A Valuable Alloy

A New Idea in Electric Locomotives

Why the N. & W. Electric Locomotives have Polyphase Motor

By B. K. Reynolds

A Simple Wireless Telephone Set

Radio-Active Substances in the Air and Atmospheric Fog

A Study of Atmospheric Conditions of Importance to the Aviator

A New Idea in Cutting Metals

Aluminium Bronze

Substitute for Brass Containing no Zinc

Fighting in the Air

The Influence of Design on Tactics

Identification of Gems by the Microspectroscope

Monster Extinct Reptiles

Some Recent Restorations at the National Museum

By R. W. Shufeldt

Physiological Importance of Phase Boundaries—II

A Consideration of the Physical and Chemical Systems Concerned in Living Cells

By W. M. Bayliss

Artificial Daylight for the Microscope

Printing Ink and Printing Paper

Technical Details Relating to the Materials of which Books are Made

Slush Castings

Patents that Expired in 1915

Many Valuable Inventions Now Free to the Public

The Gas Turbine

Potash Deposits in India

New Books, Etc.


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