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Considerations Before Opening Mines

Legal and Other Matters

By Arthur J. Hoskin

Methods of Testing Coatings for Cement Surfaces

Most Preparations on the Market Have Not Yet Stood the Test of Time

By Cloyd M. Chapman

Ceylon: The Island of Jewels

A Rich Industry Monopolized by the Natives

By Leopold Claremont

A Review of Animal Experimentation—I

Its Benefits to Mankind

By W. B. Cannon

Railroad Building in Alaska

A Remarkable Railway Engineering Feat

By Day Allen Willey

Wool Pulling

How the Fleece is Separated from Sheeps' Hides

By Robert Dantzer

Wireless Telegraphy in Railway-ferry Service

A New Method of Color Photography

A One-Plate Process Without Pigment

Tests of a Simple Engine

Taking Steam at Less Than Atmospheric Pressure

By R. C. Carpenter

Wires as a Remedy for Defective Acoustics

By F. R. Watson

Elements of Theoretical Aeromechanics

Part I.—Aerostatics

By A. F. Zahm

Colloids and Colloidal Solutions

Some Examples from Everyday Life

By Elwood B. Spear

Science Notes

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Scientific American Supplements Volume 74, Issue 1906supp

Think Outside the Gift Box