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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. XXI.-MAY, 1856.

WITH SEVEN PLATES.

NEW HAVEN: EDITORS.

NEW YORK: G. P. PUTNAM & CO.

E. HAYES, PRINTER.

CONTENTS OF VOLUME XXI.

NUMBER LXI.

Page.

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80

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