Feature

Mauna Loa, Hawaiian Volcano, Will Erupt within Three Years

Oldest American Newspaper Still Well Preserved

In Science Fields

Auto Knock Photographed in Cylinder Head

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

[Photograph]: Changes Light to Electricity

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

Front Matter

Serum Made Safe for Even Protein-Sensitive Patients

Synthetic Lubricating Oil Made out of Paraffin Wax

American Diet Lacks Vitamins despite Nutrition Publicity

Leukemia Disease of Blood Combated by Rabbit Serum