Table of Contents

January 1861; Volume s2-31,Issue 91

Hydrogeology

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On the optical phenomena presented by the Silver Spring, in Marion County, Florida
John LeConte

American Journal of Science January 1861, s2-31 (91) 1-12; DOI: https://doi.org/10.2475/ajs.s2-31.91.1

Paleobotany

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On Norbert's test plate and the striae of diatoms
W. S. Sullivant and T. G. Wormley

American Journal of Science January 1861, s2-31 (91) 12-17; DOI: https://doi.org/10.2475/ajs.s2-31.91.12
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Caricography
C. Dewey

American Journal of Science January 1861, s2-31 (91) 23-26; DOI: https://doi.org/10.2475/ajs.s2-31.91.23

Invertebrate paleontology

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On the track of an animal lately found in the Potsdam Formation
W. E. Logan

American Journal of Science January 1861, s2-31 (91) 17-23; DOI: https://doi.org/10.2475/ajs.s2-31.91.17

Solid-earth geophysics

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The motions of fluids and solids relative to the Earth's surface
W. Ferrel

American Journal of Science January 1861, s2-31 (91) 27-50; DOI: https://doi.org/10.2475/ajs.s2-31.91.27
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Abstract of discussion of the influence of the Moon on the declination of the magnetic needle, from the observations at the Girard College, Philadelphia, between the years 1840 and 1845
A. D. Bache

American Journal of Science January 1861, s2-31 (91) 98-103; DOI: https://doi.org/10.2475/ajs.s2-31.91.98

Geomorphology

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Geographical Notices. No. XV, Arctic Explorations- The Hayes Expedition, Hall's Search for the Relics of Franklin's Expedition, Capt. Parker Snow's Proposal to Search for the Franklin Relics, Heuglin's Search for Dr. Vogel in Central Africa, Medical Statistics of the U. S. Army: Squiers's Collection of Original Documents concerning the discovery of America
D. C. Gilman

American Journal of Science January 1861, s2-31 (91) 51-62; DOI: https://doi.org/10.2475/ajs.s2-31.91.51

Economic geology, geology of ore deposits

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Researches on the platinum metals
Wolcott Gibbs

American Journal of Science January 1861, s2-31 (91) 63-71; DOI: https://doi.org/10.2475/ajs.s2-31.91.63

Structural geology

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On a method of producing stereographs by hand
O. N. Rood

American Journal of Science January 1861, s2-31 (91) 71-74; DOI: https://doi.org/10.2475/ajs.s2-31.91.71

Economic geology, geology of nonmetal deposits

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Note on sources of error in the employment of picric acid to detect the presence of potash
M. Carey Lea

American Journal of Science January 1861, s2-31 (91) 75-78; DOI: https://doi.org/10.2475/ajs.s2-31.91.75

General geochemistry

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On a series of new combinations of ammonia, picric acid and metallic bases
M. Carey Lea

American Journal of Science January 1861, s2-31 (91) 78-86; DOI: https://doi.org/10.2475/ajs.s2-31.91.78

Igneous and metamorphic petrology

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The Guernsey County, Ohio, meteorites...
John Lawrence Smith

American Journal of Science January 1861, s2-31 (91) 87-98; DOI: https://doi.org/10.2475/ajs.s2-31.91.87