THE

AMERICAN JOURNAL

OF

SCIENCE AND ARTS

CONDUCTED BY

PROFESSORS B. SILLIMAN, B. SILLIMAN, JR.,

AND

JAMES D. DANA,

IN CONNECTION WITH

PROF. ASA GRAY, OF CAMBRIDGE,
PROF. LOUIS AGASSIZ, OF CAMBRIDGE,
DR. WOLCOTT GIBBS, OF NEW YORK.

SECOND SERIES.

VOL. XXXI.-MAY, 1861.

WITH FIVE PLATES AND A MAP.

NEW HAVEN: EDITORS.

m1861.

PRINTED BY E. HAYES, 426 CHAPEL ST.

CONTENTS OF VOLUME XXXI.

NUMBER XCI.

ART. I. On the Optical Phenomena presented by the "Silver-

Spring," in Marion County, Florida; by Prof. JOHN LE-

CONTE,

II. On Nobert's Test Plate and the Striæ of Diatoms; by W. S.

SULLIVANT and T. G. WORMLEY,

III. On the Track of an Animal lately found in the Potsdam

Formation; by Sir W. E. LOGAN, F.R.S.,

IV. Caricography; by Prof. C. DEWEY, -

V. The motions of Fluids and Solids relative to the Earth's Sur-

face; by W. Ferrel,

VI. Geographical Notices; by D. C. GILMAN. No. XV,

Page

1

12

17

23

Arctic Explorations-The Hayes Expedition, 51.-

Hall's Search for the Relics of Franklin's Expedi-

tion, 54.-Capt. Parker Snow's Proposal to Search

for the Franklin Relics, 57.-Heuglin's Search for

Dr. Vogel in Central Africa, 59.-Medical Statistics

of the U. S. Army: Squier's Collection of Original

Documents concerning the Discovery of America, 60.

VII. Researches on the Platinum Metals; by Prof. WOLCOTT

GIBBS, M.D.,

VIII. On a Method of Producing Stereographs by Hand; by

Prof. O. N. ROOD, (with an illustration,)

27

15

63

71

IX. Note on Sources of Error in the Employment of Picric

Acid to detect the Presence of Potash; by M. CAREY LEA,

X. On a Series of New Combinations of Ammonia, Picric Acid

and Metallic Bases; by M. CAREY LEA,

XI. The Guernsey County (Ohio) Meteorites, a complete ac-

count of the phenomena attending their fall, with a chemical

analysis of them; by Prof. J. LAWRENCE SMITH, M.D.,

XII. Abstract of a 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; by A. D. BACHE, Supt. U. S. Coast Survey, (with

a diagram,).

75

78

- 87

98