A New Estimate of the World's Age - p304

doi:10.1038/scientificamerican05171879-304

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The Longest Tunnel in the World - p304

doi:10.1038/scientificamerican05171879-304a

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The Power of Vibration Harnessed - pp304 - 305

doi:10.1038/scientificamerican05171879-304b

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When are Laws Discovered! - pp304 - 305

doi:10.1038/scientificamerican05171879-304c

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Molecular Chemistry—No. 1 - p305

doi:10.1038/scientificamerican05171879-305

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Edison's Electric Illuminator and Dr. Draper's Experiments Thirty Years Ago - p305

doi:10.1038/scientificamerican05171879-305a

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American Industries—No. 12 - p305

doi:10.1038/scientificamerican05171879-305b

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Testing Lubricants - pp306 - 307

doi:10.1038/scientificamerican05171879-306

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A Few Novelties - pp307 - 308

doi:10.1038/scientificamerican05171879-307

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New Agricultural Inventions - p309

doi:10.1038/scientificamerican05171879-309

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The Detroit River Tunnel and Bridge - p309

doi:10.1038/scientificamerican05171879-309a

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The Patentees' Protective Association - p309

doi:10.1038/scientificamerican05171879-309b

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Disinfection - p309

doi:10.1038/scientificamerican05171879-309c

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Improved Paper Cutting and Winding Machine - p310

doi:10.1038/scientificamerican05171879-310

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New Cut-Off for Steam Engines - pp310 - 311

doi:10.1038/scientificamerican05171879-310a

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The Kanchil, or Pygmy Musk - pp311 - 312

Daniel C. Beard

doi:10.1038/scientificamerican05171879-311

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Recent Mechanical Inventions - p312

doi:10.1038/scientificamerican05171879-312

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Natural History Notes - pp312 - 313

doi:10.1038/scientificamerican05171879-312a

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The Calamar - pp313 - 314

doi:10.1038/scientificamerican05171879-313

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To Inventors - p315

doi:10.1038/scientificamerican05171879-315

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Communications Received - p316

doi:10.1038/scientificamerican05171879-316

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