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Launch of the Collier “Vestal.”

A New Experiment by our Navy

Fixation of Atmospheric Nitrogen in America

By George M. Heath

A Simple Form of Polariscope

By Frederick H. Getman

Elements of Electrical Engineering.—XVIII

Current Reorganizers

By A. E. Watson

Some Late Improvements in Compressive Riveters

By Chester B. Albree

Heat and Building Materials

Discussion of the Austrian Coefficients

By W. W. Macon

The Ytterbium Group

Waterproofing Cement Structures

By James L. Davis

Natural Monuments

Some Curious Formations

By Charles Goodman

A Simple Statement of Chamber-Lin's Hypothesis of the Earth's Origin

By James Furman Kemp

Wyoming Coal Fields

Modern Biology

A Simple Statement of Its Achievements

By Edmund Beecher Wilson

The Topographic Maps Prepared by the United States Geological Survey

Buoys and Beacons

Their Various Forms and Purposes

By Max Buchwald

Well Waters of Southern Louisiana

Fishes and the Mosquito Problem

Their Serviceability as Mosquito Exterminators

By William P. Seal

Trade Notes and Formulæ

Use of Submarine Signal Bells in Fog

Engineering Notes


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