Progress of the Hudson River Tunnel - pp351 - 356

doi:10.1038/scientificamerican06041881-351

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Perpetual Motion Delusions - p352

doi:10.1038/scientificamerican06041881-352

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Polarization of Sound - p352

doi:10.1038/scientificamerican06041881-352a

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Electrical Paper - p352

doi:10.1038/scientificamerican06041881-352b

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Opening of the New Workshop of the Stevens Institute of Technology - p354

doi:10.1038/scientificamerican06041881-354

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New Belt Clasp - p355

doi:10.1038/scientificamerican06041881-355

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Telegraph Hand Car - p355

doi:10.1038/scientificamerican06041881-355a

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Engineering Inventions - p356

doi:10.1038/scientificamerican06041881-356

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Recent Decisions Relating to Patents - p357

doi:10.1038/scientificamerican06041881-357

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New Gang Boring Machine - p357

doi:10.1038/scientificamerican06041881-357a

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New Spring Grass Shears - p357

doi:10.1038/scientificamerican06041881-357b

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Feed Water Heater and Feed Pump - p358

doi:10.1038/scientificamerican06041881-358

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New Method of Spacing and Lettering Signs - p358

doi:10.1038/scientificamerican06041881-358a

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Mechanical Inventions - p358

doi:10.1038/scientificamerican06041881-358b

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John Fitch's Steamboat Experiment on Collect Pond - p359

doi:10.1038/scientificamerican06041881-359

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Leech Farming - pp359 - 361

A. W. Roberts

doi:10.1038/scientificamerican06041881-359a

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Communications Received - p363

doi:10.1038/scientificamerican06041881-363

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