Feature

Ostwald on Chemical Energy: “A Classic of Science”

Venus, Queen of May Evening Skies

Nature Ramblings: Spring Beauty

Submarines May Carry Tomato Plants to Detect Gas Leaks

Jewels Suggest Aztec King Lay in Monte Alban Tomb

Racial Factor Involved in Rate of Metabolism

Steel-like Glass Permits Centrifuge Observations

Front Matter

American Rediscovers Lost Chemical Compound

First Glances at New Books

New Aid for Deaf Transmits Sound through Bones or Teeth

Elaborate Apparatus Makes Three-Dimension Movies