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Features

The Coal Briquetting Industry in the United States

By Edward W. Parker

Dr. Bell's Man-Lifting Kite

Experiments With the “Cygnet”

A New Method of Obtaining Motive Power

The Burning of Coal without Smoke

By D. T. Randall

Elements of Electrical Engineering.-XIII

Principle of Alternating Currents

By A. E. Watson

A New Kind of Wheat

The Virtues of Durum

By Charles Cristadoro

Defects of the Farman Type of Aeroplane

The Basis for a New Geology—I

Raised Beaches and Their Cause

By H. W. Pearson

Suns and Nebulæ

An Alternation of Generations

The Mosquito as a Sanitary Problem

Diseases Caused By Mosquitoes

By Edward A. Ayer

Winter Diseases of House Plants

How They May be Prevented

Engineering Notes

Science Notes

Trade Notes and Formulae

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March 21, 1908