Feature

Skin Test for Pregnancy Gives Answer in One Hour

Nature Ramblings: Battling Bindweed

Improved Submachine Gun, Anti-Aircraft Weapon Patent

Wrist-Bone from Africa Stirs up Discussion

Congress Juggling Figures in Struggle with Seats Problem

Borers-from-within Menace Supplies for Army and Navy

Magnesium Sulfate Plaster like Cement in Strength

Nature Ramblings: Predator Problems

First Glances at New Books

Front Matter

New Radium-like Carbon May Have Medical Uses

[Photograph]: Ping Pong Balls Go to School