212 Till Ann rlcini (ri nlix/lsf. October, 1891 
AiHttlici' li'stiiiiony to tin- iiuTt coiulitioii of tlii' k-c.' in Main 
valley and vicinity is the shrinkage of the ice away from the 
mountain slopes which border it. This shrinkage must be par- 
tially counteracted 1)V the slow movement just spoken of, but it 
is very conspicuous. The ice is rarely in contact with the mount- 
ains, but has withdrawn a few feet, leaving gaps into which an 
astonishing amount of debris has been tumbled. 
Berg laic. — Two small vallej's open into Main valle}' from the 
northeast. The most easterly of these is occupied bv Berg lake, 
presenting an excellent example of a valley lake whose waters 
hold their position in virtue of an ice barrier across the valley 
mouth. In this lake also float ice liergs derived from the ice 
barrier which holds the lake in place. Two enormous moraines 
extend from the mouth of this valley to the ice front. Their 
great size compared to the size of the valley in which they must 
originally have been formed is a matter worthy of comment 
Here also the slow creep of the ice away from its highest point 
must be felt, and accounts for the occasional berg which the ice 
furnishes to the lake. What becomes of the surplus water of the 
lake is not known, luit it seems probal)le that it must find its way 
into Main lake. A comparatively slight extension of the latter 
would cause the two to coalesce. The same cause that has re- 
moved the ice from the upper part of Main valley has removed it 
from Berg lake valley. Grlaciers ordinarily retreat up their val- 
leys. Here the opposite course of proceedure seems to have 
obtained, and the glaciers have disappeared from the small val- 
le3's while thick ice remains in the larger one into which the others 
formerly poured their supply. 
The Girdled glacier. — The westerly of the two valleys spoken 
of is occupied by a very beautiful little white glacier, with a 
very steep slope. The clean character of its surface and the 
small amount of debris which it brings down, are as astonishing 
on the one hand, as are the great moraines which have come out 
of Berg lake valley on the other. This glacier received its name 
from Dr. Keid because of the curious disposition of the moraines 
around the end of its vallej'. A moraine curves gracefully 
around its front, from the end of the ridge on the west, to the 
end of the ridge on the cast side of its valley. Another moraine, 
parallel to this, emerges from Granite canon to the west, curves 
around outside of the first, and dies out against the mountain 
