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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.

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CONTENTS OF VOLUME XX.

NUMBER LVIII.

Page.

II. Description of a new species of Clathropteris, discovered in
the Connecticut Valley Sandstone; by E. HITCHCOCK, Jr., M.D., 22

III. On the Periodical Variations of the Declination and Directive

Force of the Magnetic Needle; by Prof. W. A. NORTON,

IV. On the Periodical Rise and Fall of the Lakes; by MAJOR

LACHLAN,

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Physics.-On the Expansion of certain substances by Cold, by W. J. MACQUORN RAN-

KINE, F.R.SS., etc., 113.-On the Nature of the Force by which Bodies are repelled

from the Poles of a Magnet; preceded by an account of some Experiments on Mole-

cular Influences, by JOHN TYNDALL, Ph.D., F.R.S., 114.-Further Experiments and

Remarks on the Measurement of Heights by the Boiling Point of Water, by Professor

J. D. FORBES, 117.

Mineralogy and Geology-Herrerite identical with Smithsonite, by Dr. F. A. GENTH, 118.

-Analyses of the Meteoric Iron from Tuczon, Province of Sonora, Mexico, by Dr.

F. A. GENTH, 119.--On the Physical Geology of the Himalaya, by CAPTAIN RICHARD

STRACHEY, F.R.S., F.G.S., 121.-Eruption of Vesuvius, 125.-Notice of recent publi-

cations, 128, 129.

Botany and Zoology.-Poetry of the Vegetable World, by M. J. SCHLEIDEN M.D., edited

by ALPHONSO WOOD, M.A., 129.-De Vriese and Harting; Monographie des Marat-

tiacées Pritzel; Iconum Botanicarum Index Locupletissimus: Botany of the Southern

States, by Prof. JOHN DARBY, A.M., 131.-Wheat from Egilops, 134.-Botanical Ne-

crology and Intelligence: Description of a New genus of Crinoidea; by LUNSFORD P.

YANDELL, M.D., 135.—

Astronomy-Elements of Dien's Comet: New Planets: New Comet, 137.-Cause of the

Zodiacal Light, by Rev. GEORGE JONES, 138.

Miscellaneous Intelligence.—Contributions to Meteorology, by CHARLES SMALLWOOD, M.D.,

139.-Microscopes of American Manufacture, 142.-Melloni: On the Application of

Photography to Astronomical Observations, by Sir JOHN F. W. HERSCHEL, 143.-Pres-

ervation of Insects: Geological Survey of Great Britain: American Association for the

Advancement of Science, 144.-Anesthesis, 145.—Obituary.—Sir Henry Thomas de la

Beche, 145; G. B. Greenough, 147.-A Treatise on the Differential and Integral Cal-

culus, and on the Calculus of Variations, by EDWD. H. COURTENAY, LL.D.: Practical

Meteorology, by JOHN DREW, Ph.D., F.R.A.S., 148.-Report on the Agriculture and

Geology of Mississippi, by B. L. WAILES: Contributions to the Natural History of the

United States, by LOUIS AGASSız, 149.-Report on Crustacea, by JAMES D. DANA: No-

tices of new publications, 151, 152.

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