Haui Uri 
THE REUSS. 
203 
Lake of Egeri to Schindellegi. Both the Mollasse 
arches have their summits razed. The Rigi and 
Rossberg represent the south wing of the south arch, 
and dip towards the lake. For the relation of the 
Rigi to the Vitznauerstock see ante, p. 60. 
If we look at the map we shall see th.at the 
Reuss makes a considerable detour by I.ucerne. The 
original course probably was by Schwyz, through the 
Lake of Lowerz, and the Lake of Zug, rejoining its 
present course by the valley of the T^orze. A slight 
relative elevation of the country round the Lake of 
Zug, or rather a depression further north, probably 
gave rise to the change, forcing the Reuss to alter its 
direction, and overflow at Lucerne. 
As already pointed out, the old river terraces of 
the Reuss can still be traced in places below Zug, 
and (see vol. i. p. 248) slope the reverse way to the 
valley. From this and other evidence we conclude 
that there has been a relative elevation of the land, 
which has dammed up the valley, thus turned parts 
