OCCASIONAL PAPEES 



THEORY OF GLACIERS 



NOW FIRST COLLECTED AND CHRONOLOGICALLY ARRANGED. 



A PREFATORY NOTE ON THE RECENT PROGRESS AND 

 PRESENT ASPECT OF THE THEORY. 



BY 



JAMES D. FORBES, D.C.L., F.E.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 Palenno, 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. 



MDCCCL1X. 







