104 
SCENERY OF SWITZERLAND. 
Pavilion de Bellevue during liis geological studies. 
He does not know which to commend most, the 
splendid air or the magnificent views, which, as he 
justly says, surpass all description. 
The true continuation of the valley of Chamouni 
eastwards is not the Col des Montets and the Tete 
Noir, but the Col de Balme. The Arve descends in 
a longitudinal valley to Les Houches. Here the 
western line of the valley passes over the Col de 
Voza. The river, however, breaks away to the north 
in a transverse valley, cutting across the Carboni- 
ferous strata. The contrast of the narrow and wild 
transverse gorge, with the more open longitudinal 
valley above, is very striking. Below Servoz for a 
short distance the river again occupies a longitudinal 
valley, and then from Sallenches runs transversely 
by the narrow gorge at Cluses to Bonneville, where 
it emerges on a wide alluvial plain. 
As already mentioned, the Val Ferret on the 
south, and the mountains on the west, which stretch 
from the Rhone valley, south of St. Maurice, to the 
valley of the Arve at Servoz — the Mont Ruan, tlie 
Cheval Blanc, and the Mont Buet, are Jurassic: and 
the question arises whether the Secondary strata once 
extended in a great arch over the Protogine of Mont 
Blanc. This can now be confidently answered in 
