Table of Contents

February 1881; Volume s3-21,Issue 122

General geochemistry

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Notice of Julius Thomsen's thermochemical investigation of the molecular structure of the hydrocarbon compounds
J. P. Cooke

American Journal of Science February 1881, s3-21 (122) 87-98; DOI: https://doi.org/10.2475/ajs.s3-21.122.87

Applied geophysics

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On a determination of the force of gravity at the summit of Fujiyama, Japan
T. C. Mendenhall

American Journal of Science February 1881, s3-21 (122) 99-103; DOI: https://doi.org/10.2475/ajs.s3-21.122.99

Areal geology

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Extract from a report ... [on Alaska]
William Healey Dall

American Journal of Science February 1881, s3-21 (122) 104-111; DOI: https://doi.org/10.2475/ajs.s3-21.122.104

Invertebrate paleontology

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Relation of Devonian insects to later and existing types
Samuel Hubbard Scudder

American Journal of Science February 1881, s3-21 (122) 111-117; DOI: https://doi.org/10.2475/ajs.s3-21.122.111
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Notice of a new genus and species of air-breathing mollusk from the Coal Measures of Ohio, and observations on Dawsonella.
Robert Parr Whitfield

American Journal of Science February 1881, s3-21 (122) 125-128; DOI: https://doi.org/10.2475/ajs.s3-21.122.125
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Remarks on the genus Obolella.
Silas Watson Ford

American Journal of Science February 1881, s3-21 (122) 131-134; DOI: https://doi.org/10.2475/ajs.s3-21.122.131

Igneous and metamorphic petrology

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On the meteoric iron of Lexington Co., S.C.
Charles U. Shepard

American Journal of Science February 1881, s3-21 (122) 117-119; DOI: https://doi.org/10.2475/ajs.s3-21.122.117

Quaternary geology

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An attempt to calculate approximately the date of the glacial era in eastern North America, from the depth of sediment in one of the bowl-shaped depressions abounding in the moraines and kames of New England
George Frederick Wright

American Journal of Science February 1881, s3-21 (122) 120-123; DOI: https://doi.org/10.2475/ajs.s3-21.122.120

Economic geology, geology of ore deposits

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A remarkable nugget of platinum
P. Collier

American Journal of Science February 1881, s3-21 (122) 123-124; DOI: https://doi.org/10.2475/ajs.s3-21.122.123

Mineralogy

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Hiddenite, an emerald-green variety of spodumene
John Lawrence Smith

American Journal of Science February 1881, s3-21 (122) 128-130; DOI: https://doi.org/10.2475/ajs.s3-21.122.128

Stratigraphy

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The Millstone grit in England and Pennsylvania
Henry Martyn Chance

American Journal of Science February 1881, s3-21 (122) 134-135; DOI: https://doi.org/10.2475/ajs.s3-21.122.134

Vertebrate paleontology

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Principal characters of American Jurassic dinosaurs, IV
Othniel Charles Marsh

American Journal of Science February 1881, s3-21 (122) 167-170; DOI: https://doi.org/10.2475/ajs.s3-21.122.167