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Third International Aero Exhibition at Olympia, 1911

The Air-brake as Related to Proǵress in Locomotion—III

The History of a Great Invention

By Walter V. Turner

Rules Governing the Competition for the $15,000 Flying Machine Prize Offered by Mr. Edwin Gould

Wireless Teleǵraphy and Airships

A Review of Recent Experiments

The Bruceton Experimental Mine

Its Plan and Purpose

By George S. Rice

The Production of Liǵht by Livinǵ Orǵanisms

The Chemistry of Biophotogenesis

By F. Alex. McDermont

The Camphor Industry

Japanese and Formosa Methods

A Quarter Century of Experimental Embryoloǵy

Wilhelm Roux and His Work

Road Makinǵ in the United States

The Present Status of the Use of Bituminous Materials

Frostinǵ, Etchinǵ, and Colorinǵ of Incandescent Lamps

Hints for the Manufacturer and Amateur


Getting at the Facts of Mental Life


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