Possible Sources of Potash in America
With Notes on Methods of Recovery
Features
Grafting Bone and Skin in French Hospitals
A Valuable Alloy
A New Idea in Electric Locomotives
Why the N. & W. Electric Locomotives have Polyphase Motor
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
Physiological Importance of Phase Boundaries—II
A Consideration of the Physical and Chemical Systems Concerned in Living Cells
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
