Volume 31, Issue 2
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Features
Some of the Uses of Paraffin
The Railways of the United States
Four Footed Motion
Government Aid to Scientific Investigation
New Law Concerning Copyrights for Labels
Refrigerating Mixtures and Their Physiological Effects
Scientific and Practical Information - July 11, 1874
Progress of the Fireless Locomotive
The Effect of Air Pressure on Animal Life
Improved Steam Engine
The Gravitation Compass
A Navigable Diving Bell
Astronomical Notes - July 11, 1874
Observatory of Vassar College.