Volume 80, Issue 2074supp
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Features
Gas Turbines brought to Practical Efficiency
Some Recent Discoveries in Astronomy
Various Directions in Which Important Progress Has Been Made
The Formation of Primitive Oceans
The Ultramicroscope
And its Application to Modern Biology
Insects' Nests
Ingenious Methods of Construction and Curious Materials Employed
Living Magnets
Analogies Between Plants and Animals and Steel Magnets
Notes from a Volcano Laboratory
“Personal Documents” in the Case of Kilauea and Mauna Loa
The German State Railroad Lines
A Most Important Factor in the German Campaigns By Frederick William Wile
Investigating Radium Ores in Canada
The Efficiency of Explosives
Man's True Thermal Environment
Signaling on Railway Trains in Motion—I
Various Systems of Engine Cab Signals Used in France
Geographic Aspects of the War—II
How Topographical Conditions Affect Military Operations