Whose Baby?
Determining Parentage by Blood Groups
Features
Southern Pine for White Paper
The Newer Photography
Later Year Trends in the Development of Cameras and Films Have Revived Interest in Photography as a Serious Hobby. In Coming Months This Page Will be Devoted to the Peculiar Problems Thus Brought to the Fore, Authoritative Discussion of Which is not Available Elsewhere...
Barnard's Black Nebulae
Down The Ways
It Is a Difficult Engineering Job to Launch a Large Ship Successfully
Industry--Research
Business Management Gets the Research Point of View
Another Job for the Codfish
It Assisted in Building Up Our Commerce and Industry; It Can Help Stamp Out a Widespread Disease
Earthquakes
What They Are, How the Seismologist Observes Them, and Why They Are Observed
Amateur Astronomers' Activities in Indianapolis
Sundials and their Construction--IV
Declining and Reclining Dials
Breeding Better Trees
Dew Ponds
How Water is Obtained on the Bleak Downs of England Where There are No Springs or Streams
Departments
- Departments
Across the Editor's Desk, May 1934
Back of Frontispiece, May 1934
The Age-Old Survival of the Fittest
Our Point of View, May 1934
Punching Glass Lenses, Metal Surface is Liquid and more
Inventions and Industry, Pictures on Labels and more
Books Selected by the Editors, May 1934
