New Dynamite Gun - pp399 - 400

doi:10.1038/scientificamerican12291888-399

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Dogs that Learn Trades - p400

doi:10.1038/scientificamerican12291888-400

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“A Possible Revolution in Medicine” - pp400 - 401

doi:10.1038/scientificamerican12291888-400a

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Simple Experiments in Physics - p402

M. Hopkins

doi:10.1038/scientificamerican12291888-402

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An Improved Churn - p402

doi:10.1038/scientificamerican12291888-402a

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An Improved Extension Ladder - pp402 - 403

doi:10.1038/scientificamerican12291888-402b

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Offset Mechanism for Sawmill Carriages - p403

doi:10.1038/scientificamerican12291888-403

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An Improved Steam Steering-Gear - p403

doi:10.1038/scientificamerican12291888-403a

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The Garabit Viaduct - pp403 - 405

doi:10.1038/scientificamerican12291888-403b

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A Simple Device for Threading Needles - p405

doi:10.1038/scientificamerican12291888-405

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Test of the Cast Steel Breech Loading Rifle - pp406 - 407

doi:10.1038/scientificamerican12291888-406

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Gigantic Fossil Mammals - p407

doi:10.1038/scientificamerican12291888-407

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To Inventors - p409

doi:10.1038/scientificamerican12291888-409

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