Feature

American Pyramids Served as Timepieces, Survey Shows

Seasons Affect Birth Rate and Infant Health

Front Matter

The Age of Man: “A Classic of Science”

Alcoholized Gasoline Inferior, Says Petroleum Chemist

For Red Men Only

Sea Level Higher on Pacific than on Atlantic Coasts

First Glances at New Books

Galaxy of Foreign Scientists Invade Century of Progress

Tannic Acid Bath Features Modern Treatment of Burns

In Science Fields

Tut-Ankh-Amen’s Mother-in-Law