The Microscope in Metal Study
Some of the Difficulties of Illumination and How They Are Met
Features
Effect of Water on Strength of Concrete
Corrosion of Brass in Sea Water
Birds and the Farmer
The Hawks of the Canadian Prairie Provinces in Relation to Agriculture
Radium and Radio-Activity—II
A Consideration of Some of the Physical and Chemical Aspects
“Protactinium,” a New Radio-Active Element
Lateral Deviation of Projectiles
Lost City
The Forgotten Dwellings of a Forgotten People in New Mexico Photographs copyright by E. M. Newman
Textile Fibers in Germany
Wind Circulation of the Globe
The Mineral Elements in Animal Nutrition
With Special Reference to Source and Administration of Iodine and Phosphorus
A Scientific Coin Problem
How Some Mysterious Numerical Effects Can Be Produced
Hints for Photographers from Motion Pictures
Digestibility of artificially Dried Feed
Analysis of the Mechanism of Speech
The Yellowing of Paper
A Study of the Causes or Principal Factors Producing this Deterioration
The Lens for a Studio
Nature's Factories for Sugar and Starch
Ocean Temperatures and Seasonal Weather in Southern California
(Extracts from open letter, dated La Jolla, Cal., Nor. 8, 1918)
