298 THE BEAUTIES OF NATURE CHAP, 
the Jura. Hence the main drainage runs 
along the line from Yverdun to Neuchatel, 
down the Zihl to Soleure, and then along the 
Aarto Waldshut: the Upper Aar, the Emmen, 
the Wiggern, the Suhr, the Wynen, the lower 
Reuss, the Sihl, and the Limmat, besides 
several smaller streams, running approxi- 
mately parallel to one another north-north- 
east, and at angles to the main axis of 
elevation, and all joing the Aar from the 
south, while on the north it does not receive 
a single contributary of any importance. 
On the south side of the Alps again we 
have the Dora Baltea, the Sesia, the Ticino, 
the Olonna, the Adda, the Adige, etc., all 
running south-south-east from the axis of 
elevation to the Po. 
Indeed, the general slope of Switzerland, 
being from the ridge of the Alps towards the 
north, it will be observed (Fig. 42) that almost 
all the large affluents of these rivers running 
in longitudinal valleys fall in on the south, as, 
for instance, those of the Isére from Albertville 
to Grenoble, of the Rhone from its source to 
Martigny, of the Vorder Rhine from its source 
