Feature

Paper Bags of Rock Dust Prevent Dust Explosions

Magnetic Forces Aid Swedish Traffic Control

Nature Ramblings: A New Start

Front Matter

New Year Will Bring Attack on Causes of Mental Ills

America Was News to Sixteenth Century China

Engineers Coin New Term, Called See-Level

Distinction Drawn between ‘Flu and Similar Maladies

Limits of Universe Still beyond Astronomers’ Reach

Early Crop Improvement Held Mostly Unconscious

1938 Birth Rate up, Death Rate Is Down

Newest Vacuum Pumps Create Low Pressure