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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.

VOL. XXIX. - MAY, 1860.

SECOND SERIES.

WITH ONE PLATE AND THREE DIAGRAMS.

NEW HAVEN: EDITORS.

1860.

PRINTED BY E. HAYES, 50 CHAPEL ST.

CONTENTS OF VOLUME XXIX.

NUMBER LXXXV.

Page.

ART. I. On the Origination and Distribution of Species :-Intro.

ductory Essay to the Flora of Tasmania ; by Dr. Joseph D.

HOOKER, . . . . . . . . .

II. Some General Views on Archæology ; by A. Morlot, . 25

III. On a new genus of Patelliform shells from the Cretaceous

rocks of Nebraska ; by F. B. Meek and F. V. HAYDEN.-

(With a Plate.), · · · · · · · · 33

IV. General account of the results of the discussion of the De.

clinometer observations made at Girard College, Philadel.

phia, between the years 1840 to 1845, with special refer.

ence to the eleven year period; by A. D. BACHE, Super.

intendent of the U. S. Coast Survey.-(With a Diagram), 36

V. A Visual Method of effecting a Precise Automatic Compari.

son of Time between distant stations; by Jonathan Homer

LANE.—(With a Plate.), . . . . . . 43

VI. On Osmious Acid, and the position of Osmium in the list

of Elements; by Prof. J. W. MALLET, ·

VII. The Comas and Tails of Comets; by Prof. W. H. C.

BARTLETT, . . . . . . . . . 62

VIII. On Sodalite and Elæolite from Salem, Massachusetts ; by

J. P. KIMBALL, P.D., . . . . . . .

IX. Description of Nine new species of Crinoidea from the Sub.

carboniferous Rocks of Indiana and Kentucky; by Sidney

S. Leon and S. A. CASSEDAY, . . . . .

X. Theoretical Determination of the Dimensions of Donati's

Comet; by Prof. W. A. Norton, .

XI. Geographical Notices. No. X, ..

XII. The Great Auroral Exhibition of August 28th to Septem.

ber 4th, 1859.-2d Article,

..

XIII. On Numerical Relations existing between the Equivalent

Numbers of Elementary Bodies ; by M. Carey Lea, , 98

XIV. Remarks on the Dissolution of Field Ice; by Chas. Whit.

TLESEY, · · · · · · · · · 111

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