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The Manufacture of Varnished Leather in France - p401
doi:10.1038/scientificamerican09071850-401d
American Association for the Advancement of Science - p402
doi:10.1038/scientificamerican09071850-402
History and Construction of the Thermometer - p403
doi:10.1038/scientificamerican09071850-403
A Galvanic or Electric Harpoon for Parallzlng Whales - p404
doi:10.1038/scientificamerican09071850-404d
Improvements in Locomotives—The Grand Object Accomplished - p405
doi:10.1038/scientificamerican09071850-405a
A Patent Wanted. Who would have Believed It? - p405
doi:10.1038/scientificamerican09071850-405c
History of Propellers and Steam Navigation - p408
doi:10.1038/scientificamerican09071850-408b
