Dredging Out the Culebra Slide, A New Source of Paper Pulp, and more

X-Ray Photographs of Microscopic Objects

How They Are Made by the Goby Method

A Wind Shield For Bicyclists, The Renewed Siege of the Atlantic, A Modern Battle-Practice Target, and more

The Soot-and-Dust-fall of English Towns and Cities; 200 to 2,000 Tons per Square Mile per Annum

How it is to be Measured

Radium in Cancer

Its Scope of Usefulness and Its Limitations

Going Through the Shops-III

The Associate Editor of the Scientific American Witnesses Some of the Methods Used in Obtaining Extreme Accuracyin High Grade Motor Cars

Farm for Jungle Folk

Feeding the Animals of a Zoo and What it Means

The Cleaning of Scientific Instruments Composed of Glass

The Industrial Need of Technically Trained Men-IX

The Possibilities in Iron and Steel Making