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Armored Trains in South Africa

Japanese Paper

Altitudes of Railways above Sea-Level

The German Beer Industry

Origin of the Word “Physician.”

Cycle Construction and Design

By Archibald Sharp

The Homemade Windmills of Nebraska

By Erwin Hinckley Barbour

The Development of the Arch Principle

Luminous “Vortex Rings.”

The Resistance of the Air

The Catalytic Process for the Manufacture of Sulphuric Acid

By Frederick H. McGahie

Armored Turrets

The Mors Carriage

By Velox

Trade Suggestions from United States Consuls

Selected Formulæ

Miscellaneous Notes

Trade Notes and Receipts

The Canker Worm

By Grant Allen

Phylogeny of Rust

Kauri Gum

Struck by a Fragment of a Meteor

A New Trade Route to Siberia

A Novel Trap for Cockroaches

Preservatives and Dyes in Articles of Food

Why is the Negro Black?

Car Lighting with Pintsch Gas, City Gas and Acetylene Mixture



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January 20, 1900

Science for the Modern World