44 
SCENERY OF SWITZERLAND. 
supply, and the size of which they account for by 
glacial action, especially as these wider valleys occupy 
just the courses of the ancient glaciers. 
Por instance, the Rohnthal runs almost from the 
lower end of the Lake of Sempach westwards to 
Scholz on the River Wigger. 'fhis broad valley is 
drained by a little stream, the Rohn, and instead of 
narrowing upwards, retains almost its full width. A 
little to the north again is the valley of the Hurn- 
bach, which presents very similar characteristics. 
Kaufmann explains these features by suggesting that 
the glacier which came down the valley of the Suhr 
w-as obstructed by the hill of Wohlen below the Lake 
of Sempach, and broken up; one branch passing 
down the present valley of the Suhr, another down 
that of the Rohn, while a portion of the ice sur- 
mounted the hill and continued in a direct course 
down the valley of the Hurnbach. The pressure of 
the ice caused by this obstacle may possibly account 
for the depression now occupied by the I,ake of 
Sempach. The valley of the Bienz, to the west of 
the Reuss, which is out of all proportion to the size 
of the present stream, was perhaps occupied by the 
Reuss m ancient times. The valley contains several 
moraines, especially at Othmarsingen, where evidently 
for a considerable time was the head of the glacier. 
