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THE

AMERICAN JOURNAL

OF

SCIENCE AND

AND ARTS.

CONDUCTED BY

PROFESSORS B. SILLIMAN AND JAMES D. DANA,

IN CONNECTION WITH

PROFESSORS ASA GRAY, AND WOLCOTT GIBBS,

OF CAMBRIDGE,

AND

PROFESSORS H. A. NEWTON, S. W. JOHNSON,
GEO. J. BRUSH, AND A. E. VERRILL,

OF NEW HAVEN.

SECOND SERIES.

VOL. XLVII.-[WHOLE NUMBER, XCVII.]

Nos. 139, 140, 141.

JANUARY, MARCH, MAY.

WITH TWO PLATES.

NEW HAVEN: EDITORS.

1869.

PRINTED BY TUTTLE, MOREHOUSE & TAYLOR, 221 STATE ST.

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