310 THE BEAUTIES OF NATURE OMAP, 
was pushed on one side by the Borgne. The 
Rhone, however, had no choice, it was obliged 
to force, and has forced its way over the cone 
deposited by the Borgne. The Rhine, on the 
contrary, had the option of running down by 
Vaduz to Rheinach, and has adopted this 
course. The watershed between it and the 
‘Weisstannen is, however, only about 20 feet 
in height, and the people of Zurich watch it 
carefully, lest any slight change should enable 
the river to return to its old bed. The result 
of all these changes is that the rivers have 
changed their courses from those shown in Fig. 
43 to their present beds as shown in Fig. 44. 
Another interesting case is that of the 
Upper Engadine (Fig. 45), to which attention 
has been called by Bonney and Heim. The fall 
of the Val Bregaglia is much steeper than that 
of the Inn, and the Maira has carried off the 
head-waters of that river away into Italy. 
The Col was formerly perhaps as far south as 
Stampa: the Albegna, the Upper Maira, and 
the stream from the Forgno Glacier, originally — 
belonged to the Inn, but have been captured 
by the Lower Maira. Their direction still 
