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Improvement in Machines for Making Paper - p225
doi:10.1038/scientificamerican04061850-225a
Correspondence of the Scientific American - p226
doi:10.1038/scientificamerican04061850-226
Improved machine for Doubling and Twisting Silk - p228
doi:10.1038/scientificamerican04061850-228b
Bill for the Reform of the Patent Laws - p229
doi:10.1038/scientificamerican04061850-229e
History of Propellers and Steam Navigation - p232
doi:10.1038/scientificamerican04061850-232a
