Mali' Glacier Iie(j(Oii, AJaxl-a. — Ci(xJtl/t(j. 211 
snow-covered on the one side, and perfeetl}' bare on the other. 
Some cause not evident has locally produced a greater and more 
rapid disappearance of snow and ice from the vicinity of Main 
valley than has elsewhere taken place. Snow fields occur on Mt. 
Young, the highest and most imposing mountain in the vicinity. 
But these form very small glaciers and the valleys enclosing Mt. 
Young are free from ice. The ice occupjing the upper part of 
Main valley terminates abruptly at the edge of a long, narrow 
lake — Main lake — whose long axis is at a high angle with the 
trend of the valley, and which occupies nearly its entire width. 
The eastern shore of the lake is made up of glacial debris modi- 
fied by water, and such deposits exist in considerable force in the 
tributary valleys beyond. Small bergs, evidently derived from 
the end of the glacier, float in the waters of the lake, and strand 
on its shores. From its lower end a stream of water issues, 
flowing away tow-ard Lynn canal. The lake is held in place by 
the thickness of the soft deposits on its eastern shore. 
The moraines in Main valley run directly to the shores of Main 
lake, there ending abruptly. That the rock masses from which 
thej" derived their contents, lie to the east, is clear from the nature 
of the contents. Hence the ice must formerly have completely 
filled Main valley and come from the triliutary valleys to the east. 
At the present time the supply of ice in the valley is renew^ed 
from no source whatever, except for the snow which falls upon 
its surface in winter. The highest part of the surface of the ice 
at present is some distance west of the lake. Somewhere l)eneath 
this ice, lies the divide for this valley between Glacier Ijay and 
Lynn canal. The stream flowing from Main lake flows into Lynn 
canal. It is possible that Main lake lies just on the Glacier l)ay 
side of the divide. That being the case, the draining oi the lake 
would be indefinitely postponed. In the period of greater life of 
the glacier, the glacier occupying the stream valley, and the upper 
part of Main valley must have had a rising slope for its floor, and the 
reason for its movement in this direction furnishes an interesting 
problem to be solved. At the present time the whole mass of ice 
is practically inert, but it seems inevitable that there must be a 
slow flow of the ice in both directions away from the highest point. 
This movement would add to the general lowering of the surface 
of the ice produced by melting. It must also tend to an attenua- 
tion of the moraines spread upon the surface. 
