Feature

Strange Hybrid Sheep Results from Bighorn Cross

To Plants Red Light Means “Go” but Green Is “Stop” Signal

Airships to Make Their Own Ballast while Aloft

Midwest Conquering Goiter with Iodine in Salt Cellars

Nature Ramblings: Unknown Neighbors

Geography Gives Clue to Prevention of Tooth Decay

First Glances at New Books

First Glances at New Books

Front Matter

Microfilms Hailed as New Way to Duplicate Books, Pictures

Jungle Life Blamed for Ancient Man’s Flat Head

Higher Octane Aviation Fuels Would Save $1,000 a Trip