342 A.C, Ramsay on the Glacial origin of certain Lakes 
The lesser depths (660 feet) of the Lake of Zurich were hol- 
lowed by the smaller but still large glacier that descended the 
valley of the Linth, 
This completes the evidence. 
Lakes of the Northern Hemisphere generally.—I shall now make 
a few remarks on the bearing of this subject on the glaci 
question generally. i 
It is remarkable that in Europe and North America, going * 
northward, lakes become so exceedingly numerous, that I have 
been led to suppose the existence of some intimate connexion 
between their numbers and the northern latitudes in which they 
occur. 
and the North Atlantic. This vast country, about as far s0 
la i | 
strongest glacial action, in the moutonnée forms, polish, and or 
a 
stantly recurring striation of the rocks. I have Poste a : 
a a eta ate ee 
traces. But the lake-basins could only, I believe, 
scooped out by true continental glacier-ice, like that 
Jand ; for the lakes are universal in all the ice-worn re 
a this memoir was written, I have conversed on the subject with 
, Director of the Geological Survey of Canada, who not oe 8 
views respect to the origin of American |. eral, but 
that the Am lake-basins may have scooped out by 
means. are all true rock-basins, in areas occupied by culty it 
