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The Ice-Breaking Steamer “Ermak”

The Secret History of Smokeless Powder

By an English Correspondent

Sanitary Painting

Proposed Widening of New York Streets

By N. J. Vander Weyde

A Large Snout Boring Machine

A Portable Gasoline Engine

Trade Suggestions from United States Consuls

Electrical Notes

Selected Formulæ

Miscellaneous Notes

Flammarion's Observatory

The New Cells of the Santé Prison

University of Pennsylvania Lecture Course

Peculiar Laws and Customs in the American Colonies

The Transparency of Opaque Bodies

The Mine Defense of Santiago Harbor

By E. E. Capehart

The Zickler System of Electro-Optical Telegraphy

Mosquitoes and Malaria

By Percy H. Grimshaw



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