Feature

New Chapters in American History

In Science Fields

Absolute Temperature: “A Classic of Science”

New Steel-Making Materials Aid U. S. Defense Plans

Most Observers Expected to Watch Meteor Shower

Filtrable Germs Need Not Be Extremely Small

Height of Shooting Stars Measured with Wire Frame

Nature Ramblings: Whiskey-Jack

Einstein Read Philosophy When Only 13 Years Old

First Welded Penstock Built in California

Front Matter

Science Internationalism Aided by “Scientific Immigrants”