Feature

Marx “John the Baptist” of Modern Social Science

Tone of Voice Changes When Breathing Helium

Nature Ramblings: OK’d Christmas Trees

First Glances at New Books

Front Matter

Autogiro Possesses Stability Which Airplane Cannot Match

[Photograph]: Measuring Brightness

Solid “Alcohol” Exhibited at Field Museum, Chicago

“Knockout” Windshields Urged to Reduce Injuries

New Electrical Micrometer Measures .000,005