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A Religious Ceremony of the Hopi Indians

An Initiation at Hano in Hopiland, Arizona

By J Walter Fewkes

The Main Drainage System of London

By George William Humphreys

Additive Compounds of Trinitrobenzene

The Metronome in the Workshop

Picking Ice in City Streets with a Scarifier Roller

Inviolable Envelopes

Europe at Turkey's Door

Historic, Geographic and Economic Data Bearing on Its Future

By Leon Dominian

Mechanical Difficulties in the Evolution of the Steam Turbine

A Navy Ammunition Depot

Engines for Cargo Boats

Analysis of Vocal Sounds made by Singers

Aeroplane Ambulance Work

The Minimum Radiation Visually Perceptible

By Henry Norris Russell

Sugar Cultivation in Ceylon

The Silver Voltameter as an International Standard for the Measurement of Electric Current

By E. B. Rosa and G. W. Vinal

Who are the Sane?

Cleansing the Nose and Throat

Platinum as a Gel or Colloid in the Rocks of the Pacific Coast

Graphic Charts

The Use of the Logarithmic Scale for Charting

By John Wenzel

Daylight Saving

By George Frederick Kunz

The Healing Art—I

Legends and Lore of its Genesis

By Raymond Crawford

Foreign and Colonial Labor in the French Munitions Works

Swiss Industrial and Colonial Fair

Self-Induction, the Movement of the Earth, and the Æther


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April 14, 1917

20% Sitewide for President's Day