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Features

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

From La Nature

The Principle of Inertia

Soap Bubbles

A Mathematical Game

The Taking of the Bastille

The Giant Arbor-Vitæ

(Thuja Gigantea)

Physics without Apparatus

The Annatto Bush

Building Plans and Specifications

A Delicate Test for Bismuth

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August 27, 1887

Complex Causes. Alternative Solutions.