Volume 50, Issue 19
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Features
The Maximum of Sun Spots
Patents to Foreigners-Government Purchase of Patents
Novel Door Check
Improved Breast Drill
An Improved Tool Handle
Folding Step Ladder
Improved Furnace Grate
New Buildings of Prominence in New York City
[See Frontispiece.]
Dr. Le Plongeon's Latest and most Important Discoveries among the Ruined Cities of Yucatan
( Continued from page 263.)