Mars - pp226 - 227

doi:10.1038/scientificamerican10131894-226

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An Improved Street Sweeper - p228

doi:10.1038/scientificamerican10131894-228

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An Improved Gun-Sight - p228

doi:10.1038/scientificamerican10131894-228a

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Old and New Buildings of New York - pp228 - 229

doi:10.1038/scientificamerican10131894-228b

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Pork Packing in New Jersey - pp229 - 230

doi:10.1038/scientificamerican10131894-229

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The New Croton Dam on the Cornell Site - p230

doi:10.1038/scientificamerican10131894-230

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German Shepherd Dogs - p232

doi:10.1038/scientificamerican10131894-232

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The Lowe Observatory - p233

doi:10.1038/scientificamerican10131894-233

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Hut-Building Seventeen-Year Cicadas - pp233 - 235

Benjamin Lander

doi:10.1038/scientificamerican10131894-233a

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Artificial Mirages - pp235 - 236

doi:10.1038/scientificamerican10131894-235

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To Inventors - p237

doi:10.1038/scientificamerican10131894-237b

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