The Electric Subways of the City of New York - p239

doi:10.1038/scientificamerican04201889-239

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Permeability of Cements, The Hastings Telescope, and more - pp240 - 241

doi:10.1038/scientificamerican04201889-240

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Experiments in Magnetism - p242

Geo. M Hopkins

doi:10.1038/scientificamerican04201889-242

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Improved Structure for Use as a Silo - p242

doi:10.1038/scientificamerican04201889-242a

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An Improved Wire Stretcher - p242

doi:10.1038/scientificamerican04201889-242b

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An Improved Book Support - p243

doi:10.1038/scientificamerican04201889-243

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An Improved Rocking Chair - p243

doi:10.1038/scientificamerican04201889-243a

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An Improved Pocket Knife - p243

doi:10.1038/scientificamerican04201889-243b

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An Improved Binder - p243

doi:10.1038/scientificamerican04201889-243c

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Improved Protector for Dikes or Levees - p243

doi:10.1038/scientificamerican04201889-243d

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An Improved Rope Clamp - pp243 - 244

doi:10.1038/scientificamerican04201889-243e

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Photographic Notes - p245

doi:10.1038/scientificamerican04201889-245

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Michel Eugene Chevreul - pp247 - 248

doi:10.1038/scientificamerican04201889-247

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The Rev. J. G. Wood - p248

doi:10.1038/scientificamerican04201889-248

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To Inventors - p251

doi:10.1038/scientificamerican04201889-251

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