_ vili RIVERS AND LAKES _ SE: 
indicates this; they seem as if they regretted 
the unwelcome change, and yearned to rejoin 
their old companions. 
Moreover, as rivers are 
continually cutting back 
their valleys they must of 
course sometimes meet. 
In these cases when the 
valleys are at different 
levels the lower rivers 
have drained the upper 
ones, and left dry, deserted 
valleys. In other cases, 
especially in flatter dis- 
tricts, we have  bifurca- 
tions, as, for instance, at 
Sargans, and several of 
the Italian lakes. Every 
one must have been struck 
by the peculiar bifurcation 
of the Lakes of Como and 
- Lugano, while a very slight 
depression would connect 
the Lake Varese with the 
Fig. 45.— River system of the 
Maloya. 
Maggiore, and give it also a double southern end. 
