Conditions of the Moon
Has It Passed Through a Glacial Period?
Features
Pocket Stoves of Japan
Light, Power and Irrigation in California
Childhood among the Labrador Eskimo
An Amateur's Observatory
An Attempt to Make Observation Comfortable in Cold Weather
Mechanical Power of the United States
Melting Furnaces at the British Mint
The Electrical Properties of Gases—IV
Which Enable Important Problems in Physics To Be Studied
Determination of Carbon in Steel by Micrographical Examination
Removal of Stains in the Laundry
Barometric Gradient for Discovering Unknown Seismic Zones
New Carbon Remover
The Zeiss—Abbe Refractometer
Method for the Detection of Phosphorus
Motorcycle Machine—Gun Batteries
Their Important Work in the War
Workers in Compressed Air
Precautions Adopted by the N. Y. Public Service Commissson for Protecting Their Health
Irrigation Works on the Blue Nile
Paper Yarns
Alcohol from Carbide in Switzerland
An Arc Light for Projection Lanterns
A Government Fur Farm
Shall We Eat Corn Meal?
A Question of World Economics
A Telescope as a Seismograph
Loom Weaving among the Igorots
Avoiding Collisions at Sea
Rust Prevention in Ferro—Concrete
A Workshop Method of Determining the Refractive Index of a Block of Glass, of which only one Face is Polished
The Wireless Storm Detector
Its Influence Upon the Operation of Lighting Central Stations
Some Birds of the Yellowstones
Unusual Specimens Seldom Observed by Traveler