Feature

Birds, Animals Are Vanishing

Warmer than Normal June over Most of Country

Balance Weighs by Light

New Cancer Weapon

Winter of 1949-50 Worked in Reverse

Nature Ramblings: Walrus

Short Wave Broadcasts to Be Heard Soon

Cannon-Fired Net Traps Wildfowl for Banding

Books of the Week

Cures for Skin Diseases from Air-Controlled Rooms

New Machines and Gadgets

Front Matter