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 Inch

Biggest Migration in World Is Chinese Trek to West

Pneumonia Control Speeded by New Diagnostic Method