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THE

EDINBURGH NEW
PHILOSOPHICAL JOURNAL,

EXHIBITING A VIEW OF THE

PROGRESSIVE DISCOVERIES AND IMPROVEMENTS

IN THE

SCIENCES AND THE ARTS.

EDITORS.
THOMAS ANDERSON, M.D., F.R.S.E..

REGIOS PROFESSOR OF CHEMISTRY, UNIVERSITY OF GLASGOW;
SiR WILLIAM JARDINE, BART., F.R.S.E. ;
JOHN HUTTON BALFOUR, A.M., M.D.,

F.R.SS. L. & E., F.L.S.,

REGIUB KEEPER OF THE ROYAL BOTANIC GARDEN, AND PROFESSOR OF MEDICINE AND BOTANY,

UNIVERSITY OF EDINBURGH.

FOR AMERICA,
HENRY D. ROGERS, LL.D., Hon. F.R.S.E., F.G.S.,

STATE GEOLOGIST, PENNSYLVANIA; PROFESSOR OF NATURAL HISTORY IN THE

UNIVERSITY OF GLASGOW,

JANUARY ...... APRIL 1861.

: 'VOL. XIII. NEW SERIES.

EDINBURGH:

ADAM AND CHARLES BLACK.
LONGMAN, BROWN, GREEN, & LONGMANS, LONDON.

MDCCCLXI.

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