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Herman Frasch

Recipient of This Year's Perkin Medal

The Purity of Natural Waters—II

The Influence of Aquatic Organisms, of Domestic Sewage, and Industrial Waste

By Maximilian Marsson

Electric Furnaces of the Induction Type

Electrical and Metallurgical Features, With a Summary of Costs

By C. F. Elwell

A Gasoline Switchinǵ Locomotive

A Larǵe Railway Ferry Steamer for the Volǵa

A Boat Designed for Service Under Peculiarly Difficult Conditions

By F. C. Coleman

Economic Aspects of the Smoke Nuisance

Chimneys Need Not Be “Smokestacks”

By John A. Switzer

Recent Proǵress in Spectroscopic Methods—I

Past Achievements and Future Prospects

By A. A. Michelson

The Resistance of the Air and Aviation

Eiffel's Memoir on Experimental Aerodynamics

By A. F. Zahm

The Art of Color Photoǵraphy

Its Present State and the Prospects for the Future

By J. A. St*amp*auml;rcke

Shall Contaǵious Diseases be Abolished?

What Modern Methods of Sanitation Should Do for Us

Rules Governing the Competition for the $15,OOO Flyinǵ Machine Prize Offered

By Edwin Gould

Trade Notes and Formulæ

Science Notes


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