Volume 24, Issue 608supp
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Features
The “Brennan” Torpedo
Carrying Water Mains across a River
Improved Collapsible Boat
Track Laying by Steam
How to make a Leyden Jar
The Use of the Magnetic Needle in Exploring for Iron Ore
On a New Method of Measuring Magnetic Susceptibility and Magnetic Permeability
Photography by Vital Phosphorescence
Caverns near Manitou, Colorado
Freezing Mixtures
Geology and Geography
What American Zoologists have Done for Evolution
A New Local Anæsthetic
Milton Josiah Roberts, M.D.
Harvard's New Observatory
From La Nature
The Principle of Inertia
A Mathematical Game
The Taking of the Bastille
Soap Bubbles
The Annatto Bush
Physics without Apparatus
The Giant Arbor-Vitæ
(Thuja Gigantea)