in Europe and North America. 341 
snow-field, also large glaciers, are drained through the Lakes of 
Breinzg and Thun. These, amo 
area once spread the broad glacier of the Rhone. Its great 
breadth and its depth evince the size of the glacier that over- 
low the sea-level. Both of these lie within the bounds of that 
‘Rot 
height of the land during the Glacial period. 
n Meyringen and the Grimsel. | 
The Lake of the Four Cantons is imperfectly estimated at 
Only 884 feet in depth ; but here we must also take into account 
great height and steep inclines of the mountains at its sides, — 
= The Lake of Zug, 1811 feet deep, lies in the course of the same 
_ Seat glacier, the gathering-grounds of which were the slopes 
that bound the tributaries of the Upper Reuss and the immense 
_ &nphitheatre of the Urseren Thal, bounded by the Kroutlet, the 
3 fla enhorn, the Galenstock, the St. Gothard, and the southern 
_ ‘Hanks of the Scheerhorn. 
AM. Jovr. Sci.—Secoxp Serres, Vor. XXXV, No. 105.—Mar, 1363. 
