Feature

Birds of Different Families Look Almost like Twins

Farms, Forests, Mines, Ports, Are Prizes in Eastern Strife

Rubber Cheaper than Wood Used for Kindling in England

Colds Lasting Only Few Days Give Three Months Immunity

Front Matter

In Science Fields

Python, Cold-Blooded, Becomes Warm at Times

Examinations of Blood Cells Show Progress of Tuberculosis

Insulin Crystals Studied with Long-Wave X-Rays

Only Mammoth Trunk Tip Ends Wanderings in Museum

Women Marrying Late Likely to Be Childless

Dust from Andean Eruptions Reducing Solar Radiation