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The Cork Oak

The Phylloxera

Fertilization of the Queen Bee

By T. B. Miner

The Pith Plant

The Largest Flower in the World

The Apple Tree Borer Remedy

Sponge-Borings in Marble

Cows and their Butter

Cure of Facial Neuralgia

Interesting Dental Operation—Philadelphia Dental College, Department of Oral Surgery

By J. E. Gahretson


Salt Mine Illuminated by Electric Light

The Mirror of Japan, its Magic Quality

The Electric Light

By J. T. Sprague

An Economical Arrangement of the Callaud Battery

By John Morgan

The Walled Lake in Iowa

Sun Engine

Krupp's Heavy Guns

Recipes for Dyeing

By N. Spencer Thomas

The ore Deposits of Leadville, Colo

By Carl Henrich

Cotton Yarn Dyeing

Wool Dyeing

The Silk Industry of Northern Italy

By E. T. Blakely

How to Make Photo Printing Plates

By T. Bolas


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    March 15, 1879

    20% Sitewide for President's Day