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A Reaction Propeller

The “Brennan” Torpedo

Carrying Water Mains across a River

Improved Collapsible Boat

How to make a Leyden Jar

Track Laying by Steam

The Use of the Magnetic Needle in Exploring for Iron Ore

By Bennett H. Brough

On a New Method of Measuring Magnetic Susceptibility and Magnetic Permeability

By Thomas T. P. Bruce Warren

Photography by Vital Phosphorescence

By Jno. Vansant

Caverns near Manitou, Colorado

By H. C. Hovey

Freezing Mixtures

Geology and Geography

What American Zoologists have Done for Evolution

By Edward S. Morse

A New Local Anæsthetic

Milton Josiah Roberts, M.D.

By J. J. Sullivan

Harvard's New Observatory

A Mathematical Game

The Taking of the Bastille

The Principle of Inertia

Soap Bubbles

From La Nature

Physics without Apparatus

The Giant Arbor-Vitæ

(Thuja Gigantea)

The Annatto Bush

A Delicate Test for Bismuth

Building Plans and Specifications


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August 27, 1887

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