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Experiments on Vortices

The Duplicity of a Lyræ

The Florida Phosphate Deposits

By N. H. Darton

The Revolution of the Planets Produced by the Electrodynamic Action of the Sun

By C. V. Zenger

The Cryolite Mine of Greenland


Fires—How to Prevent and how to Stop Them

Witch Hazels

Gaseous Illuminants

By Vivian B. Lewes

Apparatus for Taking Distances at Sea

Peculiarities of Leather

Photography in the Colors of Nature

By F. E. Ives

Plain Photographs Projected in Colors

Electric Motive Power on Elevated Railways

By William Nelson Smith

A Practical Electric Railway Conduit

By Stephen D. Field

An Efficient Plating Dynamo

By Geo. M. Hopkins

Photographers' Eyesight

The Magnetic Telegraph—Dr. Green's Interesting Speech

The Power of Water, or Hydraulics Simplified

By G. D. Hiscox

On the Composition of Butter

By P. Vieth

A Curious Formation of the Element Silicon

By H. N. Warren

Cost of Steel Making in Spain

Polarization without a Polarizer


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March 14, 1891

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