The Late Samuel Pierpont Langley

Gold and its Chemistry

Contemporary Electrical Science

Madame Curie's Recent Investigations of Polonium

Manufacture of Hydraulic Cements

Note on Steam-Turbines

Cement Mortar and Concrete: Their Preparation and use for Farm Purposes

Introduction

A New Gasoline Electric Railway Car

The Davy 336,000-Pound Rapid-Action Forging Press

The English Correspondent of Scientific American

Notes on Gutta Percha and Balata

Recent Processes Introduced in France for the Production of Starch

Hay Fever —A Newly-Discovered Remedy

A Convenient Camera

The Multifarious Varieties of Man

The Present Position of Radio-Activity

Ants that Weave with their own Larvæ

Engineering Notes

Science Notes

Trade Notes and Formulæ