in Europe and North America. . Baz 
roches moutonnées stand like islands through the alluvium, while 
it is also plain that the sides of the mountains above have been 
to a great height smoothed by ice. Nowhere, however, down to 
Allbrack, where the river joins the Rhine,’ did I see any “drift;” 
and this village lying close on the north side of the Jura, it 
seemed impossible that the higher ground on the south side of 
that range, between the Lakes of Constance and Geneva, should 
have been submerged during any part of the Glacial period, 
while the country on the Rhine above Basel remained above 
the sea. I therefore saw that the theory that the Pierre a bot 
and its companion blocks had been floated from the Alps by 
Marine icebergs was untenable; and a later examination of a 
i of the Jura, partly under the able guidance of Professor 
esor, fully convinced me that the ice that descended the great 
valley of the Rhone had covered much of the low country and 
abutted on the south-eastern flank of the Jura. 
end of the Lake of Geneva, and, spreading in a great fan-shaped 
i the Rhone 
ow its present outflow from the lake, and north-east to 
banks of the Aar, about half-way between Solothurn and Aarau. 
The length of this fan-shaped end of the glacier, from north- 
fast. In the eenter of this area lies the lake of Constance. 
Between these, which were the largest glaciers on the north 
Watershed of the Swiss Alps, several smaller, but still enormous, 
Glaciers flowed in a north-westerly direction from the mountains, 
—one down the Linth, through the area now occupied by the 
Lake of Zurich, another down the Upper Reuss, across the area 
i which lie the Lakes of Lucerne, Zug, and others, and a third 
down the valley of the Aar to Berne, through the country that 
now contains the Lakes of Brienz and Thun. According to 
this view (the result of the researches of the best Swiss geolo- 
gists), the greater part of the Swiss Miocene area lay deep under 
ice, and I am inclined to think that the country between the 
8reat old glaciers of the Reuss, Aar, and Rhone was much more 
Covered with ice than any map shows, the whole helping to 
* Between Basel and the confluence of the Aar and the Rhine. 
