OCCASIONAL PAPERS

ON THE

THEORY OF GLACIERS

NOW FIRST COLLECTED AND CHRONOLOGICALLY ARRANGED.

WITH

A PREFATORY NOTE ON THE RECENT PROGRESS AND
PRESENT ASPECT OF THE THEORY.

BY

JAMES D. FORBES, D.C.L., F.R.S.,

SEC. R. S. ED., F. G.S., ETC.

Corresponding Member of the Imperial Institute of France, Associate or Honorary Member of
the Bavarian Academy of Sciences, of the Academy of Palermo, of the Dutch
Society of Sciences (Haarlem), of the Helvetic Society, of the Pontifical
Academy of "Nuovi Lincei" at Rome, and of the Natural

History Societies of Heidelberg, Geneva, and Vaud;

Honorary Member of the Royal Medical Society of Edinburgh,

of the Cambridge, Yorkshire, St. Andrews, and Isle of Wight Philosophical Societies,
and of the Plymouth and Bristol Institutions, and

PROFESSOR OF NATURAL PHILOSOPHY IN THE UNIVERSITY
OF EDINBURGH.

EDINBURGH:

ADAM AND CHARLES BLACK, NORTH BRIDGE.

MDCCCLIX.

DFC 23 15873
NEW-YORK

PRINTED BY R. AND R. CLARK, EDINBURGH.

DEDICATED

ΤΟ

JOHN ADDINGTON SYMONDS, M.D.

F. R. S. E. M. R. C. PH.,

OF CLIFTON HILL HOUSE, BRISTOL,

TO WHOSE SKILL AS A PHYSICIAN,

AND

TO WHOSE UNWEARIED KINDNESS AS A FRIEND,

THE WRITER

GRATEFULLY ACKNOWLEDGES

HIS DEEP AND LASTING

OBLIGATION.