Features
Editorial Correspondence
A New Theory of Chemistry--The Galvanic Battery Dissected, and Speculations Concerning Ozone
Editorial Summary
Meyer's Safety Saddle
Recent American and Foreign Patents
Manufacturing, Mining, and Railroad Items
Progress of the Pacific Railroad--The System Adopted for Laying the Track
Extension Notice
Answers to Correspondents
Science Familiarly Illustrated
White's Improved Monkey Wrench
American Institute Fair
The Largest Pair of Propeller Engines in the World
The Relative Economy of Anthracite and Bituminous Coal in Steam Boilers
Malleable Qualities of Lead
Official Report of Patents and Claims
New Publications
Pending Applications for Reissues
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