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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.

SECOND SERIES.

VOL. XXVII.-MAY, 1859.

WITH A PLATE.

NEW HAVEN: EDITORS.

1859.

2. RAYES, PRINTER,

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