Table of Contents

September 1890; Volume s3-40,Issue 237

Geologic maps

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Rocky Mountain protaxis and the post-Cretaceous mountain-making along its course
James Dwight Dana

American Journal of Science September 1890, s3-40 (237) 181-196; DOI: https://doi.org/10.2475/ajs.s3-40.237.181

Economic geology, economics of energy sources

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The magneto-optical generation of electricity
Samuel Sheldon

American Journal of Science September 1890, s3-40 (237) 196-198; DOI: https://doi.org/10.2475/ajs.s3-40.237.196

Mineralogy

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Crystallographic notes
Samuel Lewis Penfield

American Journal of Science September 1890, s3-40 (237) 199-207; DOI: https://doi.org/10.2475/ajs.s3-40.237.199
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Chalcopyrite crystals from the French Creek iron mines, Saint Peter, Chester County, Pennsylvania
Samuel Lewis Penfield

American Journal of Science September 1890, s3-40 (237) 207-211; DOI: https://doi.org/10.2475/ajs.s3-40.237.207
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On mordenite
Louis Valentine Pirsson

American Journal of Science September 1890, s3-40 (237) 232-237; DOI: https://doi.org/10.2475/ajs.s3-40.237.232

Invertebrate paleontology

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Koninckina and related genera
Charles Emerson Beecher

American Journal of Science September 1890, s3-40 (237) 211-219; DOI: https://doi.org/10.2475/ajs.s3-40.237.211
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On Leptaenisca, a new genus of brachiopod from the lower Helderberg group
Charles Emerson Beecher

American Journal of Science September 1890, s3-40 (237) 238-240; DOI: https://doi.org/10.2475/ajs.s3-40.237.238
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North American species of Strophalosia.
Charles Emerson Beecher

American Journal of Science September 1890, s3-40 (237) 240-246; DOI: https://doi.org/10.2475/ajs.s3-40.237.240

Applied geophysics

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The effect of pressure on the electrical conductivity of liquids
C. Barus

American Journal of Science September 1890, s3-40 (237) 219-222; DOI: https://doi.org/10.2475/ajs.s3-40.237.219

Igneous and metamorphic petrology

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Notice of two new iron meteorites from Hamilton County, Texas, and Puquios, Chili, S. A
Edwin Eugene Howell

American Journal of Science September 1890, s3-40 (237) 223-226; DOI: https://doi.org/10.2475/ajs.s3-40.237.223

Stratigraphy

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The Cretaceous of Manitoba
Joseph Burr Tyrrell

American Journal of Science September 1890, s3-40 (237) 227-232; DOI: https://doi.org/10.2475/ajs.s3-40.237.227

Areal geology

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Geology of Mon Louis Island, Mobile Bay
Daniel W. Langdon

American Journal of Science September 1890, s3-40 (237) 237-238; DOI: https://doi.org/10.2475/ajs.s3-40.237.237

Sedimentary petrology

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Notes on the microscopic structure of oolite, with analyses
Erwin Hinckley Barbour and J. Torrey

American Journal of Science September 1890, s3-40 (237) 246-249; DOI: https://doi.org/10.2475/ajs.s3-40.237.246