Table of Contents

September 1880; Volume s3-20,Issue 117

General geophysics

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On the new action of magnetism on a permanent electric current
E. H. Hall

American Journal of Science September 1880, s3-20 (117) 161-186; DOI: https://doi.org/10.2475/ajs.s3-20.117.161

General geochemistry

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The colors of thin blowpipe deposits
C. H. Koyl

American Journal of Science September 1880, s3-20 (117) 187-189; DOI: https://doi.org/10.2475/ajs.s3-20.117.187

Vertebrate paleontology

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The periodic character of voluntary nervous action
M. M. Garver

American Journal of Science September 1880, s3-20 (117) 189-193; DOI: https://doi.org/10.2475/ajs.s3-20.117.189
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Notice of Jurassic mammals representing two new orders
Othniel Charles Marsh

American Journal of Science September 1880, s3-20 (117) 235-239; DOI: https://doi.org/10.2475/ajs.s3-20.117.235

Structural geology

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Geological relations of the limestone belts of Westchester County, New York
James D. Dana

American Journal of Science September 1880, s3-20 (117) 194-220; DOI: https://doi.org/10.2475/ajs.s3-20.117.194

Sedimentary petrology

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Geological relations of the limestone belts of Westchester County, New York
James D. Dana

American Journal of Science September 1880, s3-20 (117) 194-220; DOI: https://doi.org/10.2475/ajs.s3-20.117.194

Stratigraphy

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The Permian and other Paleozoic groups of the Kanab Valley, Arizona
Charles Doolittle Walcott

American Journal of Science September 1880, s3-20 (117) 221-225; DOI: https://doi.org/10.2475/ajs.s3-20.117.221

Extraterrestrial geology

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Preliminary account of a speculative and practical search for a trans-Neptunian planet
D. P. Todd

American Journal of Science September 1880, s3-20 (117) 225-234; DOI: https://doi.org/10.2475/ajs.s3-20.117.225