328 HANS REUSCH 
divide, and to the fact that small local glaciers still exist in 
the region described. If Mr. Hansen is right, the snow line 
was first very much elevated, then descended below its present 
limit, and more recently has ascended again to produce the 
present conditions. 
It seems) toy themoresent 
writer that a study of the 
now existing Scandinavian 
glaciers makes another ex- 
planationof theice-dammed 
lakes more probable than 
that set forth by Dr. Han- 
sen. It may be remembered 
that the region in question 
is to be regarded as a high 
plateau intersected by val- 
leys.' Our ‘chief existing; 
glaciers are also found in 
country of the same kind, 
and in accordance therewith 
they present themselves as 
gently-domed or shield-like 
snow-fields, intersected by 
1: ¥00000 valleys free of snow. This 
has long been known of the 
Fic. 3.—The Folgefonn glacier-field. 
two great snow-fields of 
southern Norway, ‘The Folgefonn”’ and ‘‘The Justedalsbrae.” 
The Folgefonn, for instance, is dissected by valleys into three 
parts, as seen on the accompanying map. In size the Folgefonn 
is the second among the Scandinavian glaciers. The greatest is 
the Justedalsbrae. Next to this comes ‘The Svartisen” (Svart 
= swarthy, blackish; isen= ice ) situated under the polar circle. 
Even on our latest maps this glacier has been delineated as an 
unbroken elliptical snow-field with its greatest dimensions from 
south to north, although Mr. Rekstad of the Norwegian Geo- 
logical Survey had shown in 1891 that the snow-field is divided 
