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Extension of Patents by the Commissioner and by Congress - p325
doi:10.1038/scientificamerican06191858-325a
The Agricultural Division of the Patent Office - p325
doi:10.1038/scientificamerican06191858-325b
Groodyear's India Rubber Extension Case - p325
doi:10.1038/scientificamerican06191858-325c
Saleratus and Cream of Tartar in Bread - p326
doi:10.1038/scientificamerican06191858-326a
The Duration of Man's Life.—A New Idea - p326
doi:10.1038/scientificamerican06191858-326c
