Feature

Tons of Poisoned Bait Are Helping Grasshopper Control

Incoming Cosmic Rays Are Predominantly Positive

Watch for Fossils in the Rocks You Find

St. Louis Cuts Smoke Density over 11 per Cent in Drive

Tear Gas Used to Fight Weeds

Robbers Evaded Curse, Looting Noble’s Tomb

New 100-Ton Cyclotron Is to Be Built by M. I. T.

First Glances at New Books

Front Matter

New Trap for Cosmic Rays Catches Historic Picture

Death Rate Increases during Heat Waves

Round-the-World Flight Gave Test to Navigation Robot