The Microscope in Metal Study
Some of the Difficulties of Illumination and How They Are Met
Volume 87, Issue 2257supp
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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
Lateral Deviation of Projectiles
“Protactinium,” a New Radio-Active Element
Lost City
The Forgotten Dwellings of a Forgotten People in New Mexico Photographs copyright by E. M. Newman
Wind Circulation of the Globe
Textile Fibers in Germany
The Mineral Elements in Animal Nutrition
With Special Reference to Source and Administration of Iodine and Phosphorus
Hints for Photographers from Motion Pictures
A Scientific Coin Problem
How Some Mysterious Numerical Effects Can Be Produced
Digestibility of artificially Dried Feed
Analysis of the Mechanism of Speech
The Lens for a Studio
The Yellowing of Paper
A Study of the Causes or Principal Factors Producing this Deterioration
Nature's Factories for Sugar and Starch
The Testing of Cotton by Steaming
Ocean Temperatures and Seasonal Weather in Southern California
(Extracts from open letter, dated La Jolla, Cal., Nor. 8, 1918)