The Smithsonian Exhibits for the St. Louis Exposition

The Motor Truck Problem

Radium.—I

Present State of the Sulphuric Acid Industry in Europe

Improvement in Yarn Manufacture

Methods of Collecting Anthropological Material

A Chat about Spoons

The Business Opportunities of Cuba

The First Electric Trunk Railroad in Great Britain

By the English Correspondent of the Scientific american

Electrolytic Refining of Lead

Contemporary Electrical Science

On the Magneto-Elastic Detector

An Automobile Sled

Electricity vs. Mule Power on Canals

The Scherzer Rolling-Lift Bridge

Oil Shells

Exploring Weddell Sea

Electrical Notes

Engineering Notes

The Origin of Pearls

Trade Suggestions from United States Consuls

Trade Notes and Recipes

Patents!