Psychology of Invention - p112

doi:10.1038/scientificamerican08201892-112

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The Earth and the Inner Moon of Mars - pp112 - 113

doi:10.1038/scientificamerican08201892-112a

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Unscientific and Scientific Divining Rods - pp114 - 115

M. Hopkins

doi:10.1038/scientificamerican08201892-114

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The Steel Steamer Choctaw - p115

doi:10.1038/scientificamerican08201892-115

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An Improved Fire Engine Pump - p115

doi:10.1038/scientificamerican08201892-115a

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The Homestead Difficulties - p116

doi:10.1038/scientificamerican08201892-116

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The Moon and Mars - p116

doi:10.1038/scientificamerican08201892-116a

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The Looped Path of Mars - pp116 - 118

doi:10.1038/scientificamerican08201892-116b

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A Deep Basement - p118

doi:10.1038/scientificamerican08201892-118

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To Inventors - p123

doi:10.1038/scientificamerican08201892-123a

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