2l6 
SCENERY OF SWITZERLAND. 
means always correspond with those at a higher level. 
Again it will sometimes happen that rivers follow a 
course which is very difficult to explain, because, in 
fact, it has no reference to the present configuration 
of tire surface, but has been determined by the 
existence of strata which have now disappeared. 
Fig. 57. Diagram to illustrate a river now running in an anticlinal. 
It often happens, for instance, that the rivers 
now run apparently on an anticlinal, and have a 
synclinal on one side (Fig. 57), as, for instance, the 
Rhine at Dissentis (see Fig. 134, vol. 11. p. 191). 
The folds, however, being inclined, it will be seen 
from the dotted lines (Fig. 57) that when the river 
began its labour it perhaps did run in the synclinal, 
but having cut its way directly downwards is now 
