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Iodine as a Detective

Pyrogravure

A Perpetual Calendar

By R. W. Mcfarland

Cinereine

Associated Journalism

By Paul Wilcox

“Nickel-In-The-Slot” Machines

By W. L. Aughinbaugh

Some Recent Warship Designs for the American Navy

By J. H. Biles

Removal of Earth of by Means of Scrapers

Electrical Units of the Present and Future

By Francis B. Crocker

Recent Discoveries at Thebes

The Black Knot of Plum and Cherry Trees

By Byron D. Halsted

Jubilee of the Chemical Society of London

Presentation of Addresses

Building Plans and Specifications

The Peach Yellows

Useful Engineering Books

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April 11, 1891

Think Outside the Gift Box