Feature

First Glances at New Books

Volume Information

Front Matter

Completion of 200-Inch Telescope Is in Sight

[Photograph]: For Precision

Airplane Locator Probably Uses Altimeter Principle

Life and Death Closely Connected with Electricity

[Photograph]: Polar Airdrome

Secrets of Living Cells Shown by Electron Microscope

Vitamin $text{B}_{1}$ in Irrigation Fails to Aid Orange Trees

Sky as a Clock

More Tung Oil Production Needed in United States