Grindstones - pp223 - 224

doi:10.1038/scientificamerican04071866-223

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Suspension Bridges of the World - pp224 - 225

doi:10.1038/scientificamerican04071866-224

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Markets for the Month - p225

doi:10.1038/scientificamerican04071866-225

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New Publications - pp225 - 226

doi:10.1038/scientificamerican04071866-225a

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Lakin's Water-Wheel Regulator - p226

doi:10.1038/scientificamerican04071866-226

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Van Kanel's Cherry Stones - p226

doi:10.1038/scientificamerican04071866-226a

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Special Notices - p226

doi:10.1038/scientificamerican04071866-226b

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Improvements in Gold and Silver Amalga Mating - pp229 - 230

Thomas Betty

doi:10.1038/scientificamerican04071866-229

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Solid Floating on Molten Iron - p231

doi:10.1038/scientificamerican04071866-231

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Velocity of Mechanism - p231

doi:10.1038/scientificamerican04071866-231a

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Boiler Explosions on Western Waters - p231

doi:10.1038/scientificamerican04071866-231b

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The Proper Temperature for Churning Butter - p231

doi:10.1038/scientificamerican04071866-231c

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Patent Claims - pp232 - 238

doi:10.1038/scientificamerican04071866-232

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