Feature

Front Matter

Invention Makes Electricity Directly from Sunlight

Serum Made Safe for Even Protein-Sensitive Patients

Leukemia Disease of Blood Combated by Rabbit Serum

Synthetic Lubricating Oil Made out of Paraffin Wax

[Photograph]: Most Powerful X-Ray Tube for Medical Use

Music Quality Affected by Humidity in the Air

Specific Heats and Atomic Weights: “A Classic of Science”

In Science Fields

Heavy 1931 Seismic Record Brings 31 Quakes in 3 Months

[Photograph]: Changes Light to Electricity

Two Germs May Cause Blindness of Trachoma