The Preparation of Gas for Balloons
What Chemistry Has Done for Ballooning
Features
The Effect of Radium on the Higher Animals
Prof. London's Researches
The Air-brake as Related to Progress in Locomotion—I
The History of a Great Invention
Alloys for Permanent Magnets, Effect of Paris Flood on Electrical Machinery
Correspondence
The Bergen-Christiania Railway Contrasted with Two American Railroads
Breakwaters on the West Coast of Jutland
The Vornpör and Hanstholm Walls
Potash Salts: Light on an International Controversy—II
Their Uses and Occurrence in the United States
A New Method of Exploring the Earth's Interior
Legal Operations of the Department of Agriculture
New Toys
Interesting French Inventions
The Aims of Astronomy of Precision
A Resume of Modern Methods
