YIII 



RIVERS AND LAKES 



311 



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 natter 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 Fig .46.-RiTer .ystem of the 

 the Lake Varese with the Maloya ' 



Maggiore, and give it also a double southern end. 



