Volume 31, Issue 3
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Features
Recent Printing Press Improvements
Taxing Power of the Legislature
A Cometary Retrospect
Patented Car Improvements
The Mines and Minerals of India
Casting the Standard Meter
The Clamond Thermo-Electric Battery
Fountain Cave, Virginia
Scientific and Practical Information - July 18, 1874
Novel Improvements in Steam Boilers
An Improvement in Steam Pumps
A Novel Cooking Stove
Improved Hay and Cotton Press
More Curious Vegetation
Medical Notes - July 18, 1874
Erysipelas.