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SA Supplements Vol 82 Issue 2131supp

SA Supplements

Volume 82, Issue 2131supp

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Features

The Principle of Relativity

A Survey of Theories Concerning a Matter of Importance to Many Sciences

Perfected Electric Motor Blast Fans

Invisible Comets

Derelicts of the Sky That Long Ago Vanished from Sight

William H. Pickering

Certain American Turtles

A Preliminary Study of Individual Variation in their Markings

R. W. Shufeldt

Growth of Crystals under Pressure

Latent Life—II

Its Nature and Its Relations to Certain Theories of Contemporary Biology

Paul Becquerel

Light Railways in the Trenches

Cross—Channel Communication

Between England and France—Various Plans Reviewed

Artistic Pottery Made in America

The Recovery of Laboratory Waste

Destruction of Cockroaches

The Silver Voltameter

Histologic Effects of Heat on the Eye

An Account of a Series of Experiments on Rabbit Eyes

Wm. E. Shahan, Harvey D. Lamb

Photographic Methods

Stabilizing Ships by Means of Gyroscopes

The Effect of the Gyroscope Compared With Other Methods

Bird Migration—I

Wonderful Journeys Between Summer and Winter Homes

Wells W. Cooke

How Felt Hats are Made

Photometric Methods in Connection with Magic Lanterns and Moving Picture Outfits

J. A. Orange

The Latest Revision of Radioaction Data