Feature

Books of the Week

Metallic Sodium Makes Lead Sheathing Last Longer

New Machines and Gadgets

Front Matter

Mysterious Explosive

Bacteria Corrode Concrete by Producing Sulfur-Acids

Penicillin Prevents Syphilis

[Photograph]: Penguins on Ice

Ram-Jet for More Speed

Preventing Smallpox

Bomb Products Are Known

[Photograph]: Navy Transport