308 



THE BEAUTIES OF NATURE 



The Schyn also gradually worked its way 

 upwards from Thusis till it succeeded in 

 sapping the Albula, and carried it down the 



.^actua 



Fig. 43. — Biver syBtem round Chur, as it used to be. 



valley to join the Vorder Rhine near Thusis. 

 In what is now the main valley of the Rhine 

 above ' Chur another stream ate its way 

 back, and eventually tapped the main river 



