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Features

Mount Prospect Laboratory

By George C. Whipple

The Duddell Oscillograph

Liquid Air as a means for the Manufacture of Oxygen

By Henry Morton

Trade Notes and Receipts

The Frog Industry

Room Illumination Theory

Selected Formulæ

Trade Suggestions from United States Consuls

The Palaces of Fine Arts of the Exposition of 1900

A High Temperature Thermometer

Drawing Entasis of Column

Egg Canning Industry

Tests of Chains

The Dog in War

Pre-Cambrian Sediments in the Adirondacks

By James F. Kemp

Hot Water Heating from a Central Station

By H. T. Yaryan

Postage Stamp and Postal Card Distributer

Patents!

Effect of Inclination

The Scientific American Supplement. Index for Vol. 49

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