Volume 125, Issue 16
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Features
Seeds and Age, Damaged in Transit and more
Man-Made Lightning
Experiments with One-Million-Volt Transmission that Point the Way to Future Power Distribution
A Fuel Comparison
Some New Mechanical Amusement Devices, A Centrifugal Concrete Mixer
The Story of Cork
Where the Raw Material for Stoppers and Floats Comes from, and How it is Obtained
The U. S. Collection of Animal Parasites
Saving Uncle Sam's Pennies
The United States Bureau of Efficiency, and What It Is Doing to Conserve Federal Funds Abstracted from a paper read before the National Association of Manufacturers on September 13th, 1921
Blast Furnace Slag
What it is, and How it may be used as a Building Material
Our Latest Science--Eugenics
Its more important Findings and Its Bearing upon the Future of the Race
The Aviator's Tell-Tales
How the Pilot Keeps Track of Distances and Speeds, and Stays in the Air on an Even Keel
Mixing Liquids by Machine
Zebras in New York
What the Metropolis Can Show in These Striped Creatures Which Are Less Docile than They Look. Illustrations by New York Zoological Society