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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.
CNEW YORK: G. P. PUTNAM & co.

E. HAYES, PRINTEK,

CONTENTS OF VOLUME XXI.

NUMBER LXI.

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