Dr. Cook and the North Pole - p174

doi:10.1038/scientificamerican09111909-174

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The Transatlantic Record - p174

doi:10.1038/scientificamerican09111909-174a

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Economic Loss of Overcrowding - p174

doi:10.1038/scientificamerican09111909-174b

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The Elimination of Grade Crossings - p174

doi:10.1038/scientificamerican09111909-174c

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Engineering - p175

doi:10.1038/scientificamerican09111909-175

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Electricity - p175

doi:10.1038/scientificamerican09111909-175a

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Science - p175

doi:10.1038/scientificamerican09111909-175b

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Counting our People by Machine - p176

M. Hamilton Talbot

doi:10.1038/scientificamerican09111909-176

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How Sudd Chokes the Nile River - pp177 - 178

Day Allen Willey

doi:10.1038/scientificamerican09111909-177

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The Recent Curious Eclipse of the Sun - p178

doi:10.1038/scientificamerican09111909-178a

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The Seven Bridges of Königsberg and other Puzzles - pp179 - 180

J. F. Springer

doi:10.1038/scientificamerican09111909-179

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Termination of the Rheims Aviation Meeting - pp180 - 181

doi:10.1038/scientificamerican09111909-180

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A Novel Cantilever Grain Elevator - pp182 - 183

doi:10.1038/scientificamerican09111909-182

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Dr. Cook's Discovery of the North Pole - p183

doi:10.1038/scientificamerican09111909-183

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