454 



Mr. R. M. Deeley on Glacier- Grains. 



particles. In our paper we remark*: "Although it is not 

 quite clear why some of the grains should increase in size 

 and others disappear, the transference of the molecules from 

 crystal to crystal offers no difficulty " 



Since this was written I have been led to think that the 

 known laws regulating surface-tension phenomena perhaps 

 afford an explanation for the disappearance of the smaller 

 granules and the growth of the larger ones. 



Glacier-ice consists of a kind of conglomerate formed of 



glacier-grams. These grains have very irregular outlines 



Fig-. 1. 

 (t) Horizontal slice from the Eismeer of Untergrindelwald Glacier. 



Fig. 2. 

 (x) Vertical section from Mer de Glace Glacier. 



and fit closely together. Figs. 1 and 2 are drawings of slices 

 of glacier-ice as seen under polarized light. 



Fig. 2 is a sample of veined ice, the crystalline particles 

 having been sheared by the motion of the glacier. 

 * Geol. Mag. April 1895, p. 155. 



