Popular Science Monthly/Volume 20

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|The Industrial Type of Society

|1

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|Deterioration of American Oyster-Beds I

|29

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|Volcanoes, their Action and Distribution

|43

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|Physical Education XI

|56

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|A Half-Century of Science I

|65

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|The Discovery of Organic Remains in Meteoric Stones

|83

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|The Available Energy of Nature

|87

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|The Duration of Human Life

|95

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|Worry

|102

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|American Climate and Character

|109

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|Sketch of George Jarvis Brush

|117

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|Correspondence

|122

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|Editor's Table

|123

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|Literary Notices

|127

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|Popular Miscellany

|135

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|Notes

|143

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|Deterioration of American Oyster-Beds II

|145

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|Physical Education XII

|156

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|The Rise and Progress of Paleontology

|165

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|Studies of Vortex-Rings

|175

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|Equality and Inequality in Sex

|184

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|A Half-Century of Science II

|193

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|Catholicism, Protestantism, and Suicide

|220

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|A Map Review

|225

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|North America in the Ice Period

|229

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|An Experience in Science-Teaching

|242

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|Disease-Germs

|244

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|M. Paul Broca

|261

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|Correspondence

|267

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|Editor's Table

|268

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|Literary Notices

|275

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|Popular Miscellany

|284

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|Notes

|288

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|Earth-Worms and their Wonderful Works

|289

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|Astronomy in High-Schools

|300

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|Time-Keeping in Paris

|304

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|Jurassic Birds and their Allies

|312

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