Table of Contents

August 1890; Volume s3-40,Issue 236

Invertebrate paleontology

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Cheapest form of light, from studies at the Allegheny Observatory
S. P. Langley and F. W. Very

American Journal of Science August 1890, s3-40 (236) 97-113; DOI: https://doi.org/10.2475/ajs.s3-40.236.97
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Some Lower Silurian graptolites from northern Maine
W. W. Dodge

American Journal of Science August 1890, s3-40 (236) 153-155; DOI: https://doi.org/10.2475/ajs.s3-40.236.153

Mineralogy of non-silicates

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Contributions to mineralogy
F. A. Genth

American Journal of Science August 1890, s3-40 (236) 114-120; DOI: https://doi.org/10.2475/ajs.s3-40.236.114

Mineralogy

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A curious occurrence of vivianite
William L. Dudley

American Journal of Science August 1890, s3-40 (236) 120-121; DOI: https://doi.org/10.2475/ajs.s3-40.236.120
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On a new variety of zinc sulphide from Cherokee County, Kansas
James D. Robertson

American Journal of Science August 1890, s3-40 (236) 160-161; DOI: https://doi.org/10.2475/ajs.s3-40.236.160

Quaternary geology

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Classification of the glacial sediments of Maine
George Hapgood Stone

American Journal of Science August 1890, s3-40 (236) 122-144; DOI: https://doi.org/10.2475/ajs.s3-40.236.122

General geochemistry

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The direct determination of bromine in mixtures of alkaline bromides and iodides
F. A. Gooch and J. R. Ensign

American Journal of Science August 1890, s3-40 (236) 145-152; DOI: https://doi.org/10.2475/ajs.s3-40.236.145

Economic geology of ore deposits

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Siderite basins of the Hudson River epoch [Columbia County, New York]
James Putnam Kimball

American Journal of Science August 1890, s3-40 (236) 155-160; DOI: https://doi.org/10.2475/ajs.s3-40.236.155

Petrology of meteorites and tektites

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Two new meteoric irons
F. P. Venable

American Journal of Science August 1890, s3-40 (236) 161-163; DOI: https://doi.org/10.2475/ajs.s3-40.236.161

Vertebrate paleontology

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Notice of some extinct Testudinata
Othniel Charles Marsh

American Journal of Science August 1890, s3-40 (236) 177-179; DOI: https://doi.org/10.2475/ajs.s3-40.236.177