CONTENTS. XI 



Page 



XVIII. FIFTEENTH LETTER ON GLACIERS. Addressed to the 



Kev. Dr. WHEWELL [1848] . ' . . . .210 



Observations on the Analogies derived from Mud- Slides 

 on a Large Scale, and [from some Processes in the Arts 

 in favour of the Viscous Theory of Glaciers. 



Land-slips as observed by M. Collin...Mr. Milward on the 

 Phenomena of a large Mud-slide at Malta, and on the 

 Cause of the Dirt- Bands and Wrinkles of Glaciers... Con- 

 nection with Frontal Dip... Surfaces of Detrusion in Iron 

 Turnings, attended with Vertical Accumulation of 

 Material. 



XIX. SIXTEENTH LETTER ON GLACIERS. Addressed to PRO- 

 FESSOR JAMESON [1850] 220 



Observations on the Movement of the Mer de Glace down to 

 1850... Observations by Balmat, at different seasons, in 

 continuation of those formerly detailed... On the gradual 

 passage of Ice into the Fluid State ; observations of M. 

 Person... Notice of an undescribed Pass of the Alps, from 

 Chamouni to OrsiSres by the Glaciers of Tour and Salena. 



XX. ON SOME PROPERTIES OF ICE NEAR ITS MELTING POINT 



[1858] ~- . 228 



XXI. ON GLACIERS IN GENERAL* . 233 



APPENDIX. 



No. I. AN ATTEMPT TO ILLUSTRATE THE ORIGIN OF u DIRT- 

 BANDS" IN GLACIERS. By A. MILWARD, Esq. . 261 



No. II. MR. FARADAY ON THE PROPERTIES OF ICE . . 265 



* From the Encyclopaedia Britannica, eighth edition. 



