442 NOTES ON THE MUELLER GLACIER, NEW ZEALAND. 



travelled road, when covered with stiff mud, which was the 

 accurate comparison of an English traveller, whose attention was 

 directed to them for the first time. This appearance is most 

 conspicuous after rain."* 



I observed nothing of this on the Mueller Glacier, either on 

 slopes exposed to the sun or on those turned away from it. Both 

 kinds of ice melt here with about equal rapidity. The grooving 

 of the ice by runlets of water is certainly parallel to the structure 

 when it is vertical or highly inclined, but the grooves are formed 

 in several layers of both kinds of ice, and it seemed to me that 

 the compact ice melted rather more rapidly than the vesicular ice. 

 When the ice structure shows in the cliffs as horizontal or slightly 

 inclined, the grooves rim across the laminations. I cannot suggest 

 any cause for this difference between the ice of the Mueller. 

 Glacier and that of the Swiss glaciers. 



EXPLANATION OF PLATES. 



Fig. 1. Map of the glacier district (scale five miles to an inch). 



Fig. 2. Map of the Mueller Glacier (scale one mile to two inches). 



Fig. 3. Section through Mueller Glacier. 



Fig. 4. Section through White-horse Hill or the Southern Moraine. 



Fig. 5. Figure showing structure of ice at terminal ice-clififs. 



Fig. 6. Figure showing double structure in ice. 



* Travels through the Alps of Savoy, 2n(i ed., p. 159. 



