Feature

Nation Buys Ten Per Cent of Tin Stock Pile Requirements

Embryo Growth Watched in Eggs Opened on Ends

New Type of Vacuum Tube Has Unusually Long Life

Soldiers May Carry Protection against Germs

Shaking Palsy Treated with Synthetic Vitamin

[Photograph]: Playing with Lightning

First Glances at New Books

Air-Plus-Troops Tactics Operate in Limited Depth

Front Matter

Story of “Baboon Boy” Now Thrown in Doubt

Imperial Valley Earthquake Fifth in Amount of Damage

Recovers from Insanity within Fifteen Minutes