Commercial and Financial Aspects of Gas Manufacture—II

A Retrospect of the Development of a Great Industry

Automatic Railway Signaling

Arctic Exploration and the New Stefánsson Expedition

Plans of the Stefánsson Expedition

The Hardness of Metals

Theoretical Basis of Metal Working

The Control of the Mississippi Floods

Reservoirs, Reforestation and Levees Each Have Their Uses

Electric Lamps for Miners

Recent Improvements Received from England

The Mechanism of Animal Behavior

A New Paper Mill Engine

Wide Speed Range Secured by Special Designs

A Flying Frog

The Structure of the Atom—V

The Physical and Chemical Properties of the A tom Explained in the Light of Modern Theory and Experiment

New Process for Refining Crude Oil

Simple Method of Preparing Tables of Cubes

Boron as a Constituent of the Animal Body