Features
The Secret History of Smokeless Powder
By an English Correspondent
Sanitary Painting
Proposed Widening of New York Streets
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
