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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 THBEE DIAGRAMS.

NEW HAVEN: EDITORS.
1 860.

PRINTED BY E. HAYES, 50 CHAPEL BT.

CONTENTS OF VOLUME XXIX.

NUMBER LXXXV.

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

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

Hooker, -1

II. Some General Views on Archaeology; 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

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

of Elements; by Prof. J. W. Mallet, .... 49

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

Bartlett, • - -62

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

J. P. Kimball, P.D., 65

IX. Description of Nine new species of Crinoiden from the Sub-

carboniferous Rocks of Indiana and Kentucky; by Sidney

S. Lyon and S. A. Casseday, 68

X. Theoretical Determination of the Dimensions of Donati's

Comet; by Prof. W. A. Norton, 79

XI. Geographical Notices. No. X, 82

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

ber 4th, 1859.—2d Article, - - - - - - 92

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, Ill

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