Features
The Air-brake as Related to Proǵress in Locomotion—III
The History of a Great Invention
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
The Production of Liǵht by Livinǵ Orǵanisms
The Chemistry of Biophotogenesis
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
Psychanalysis
Getting at the Facts of Mental Life
