Feature

Erratum: First Glances at New Books

Erratum: April Evening Skies

Erratum: In Science Fields: Speed of A.C. Motors Varied with Vacuum Tube

Real Detective Stories Told in Medical Exhibit

Front Matter

American Pyramids Served as Timepieces, Survey Shows

Galaxy of Foreign Scientists Invade Century of Progress

Stratosphere Shell Prepared for Navigators

Adrenal Cortex May Regulate Salt and Water in Body

Tut-Ankh-Amen’s Mother-in-Law

Sea Level Higher on Pacific than on Atlantic Coasts

Mental Attacks Return Mind of Young Woman to Infancy