432 
At Comrie, Dr. Buckland marked on a map the localities 
where glacial evidences might be anticipated, if the theory 
were correct, and the result exactly coincided therewith. 
Near Fentallich were rounded masses of greenstone, partially 
covered by moraines. At Kanagart, both lateral and terminal 
moraines were apparent. Immediately below the confluence 
of Glenlednoch and Glen Garron, a ridge of gravel, resem- 
bling a medial moraine, stretches along level ground. In 
Glen Turret, a vast lateral moraine is intersected by a deep 
ravine, which apparently must have been formed when the 
valley was filled with ice more than five hundred feet above 
the level of the present lake ; and in several places in this 
locality, the rounded and polished rocks, furrowed, grooved, 
and scratched, afford strong evidence for believing that they 
owe their origin to ice, in the same manner as the rocks in 
the Alps, of which in form and features they are so exactly 
the counterpart. 
On the north bank of Loch Earn are rounded and fur- 
rowed surfaces, and at Loch Earn-head is a group of conical 
moraines at the junction of two valleys, and at the very point 
where, if they had been brought by a torrent, they would 
have been propelled into the Loch. Their position exactly 
corresponds with that of a terminal moraine. 
Mr. Lyell, who had long been acquainted with and per- 
plexed by various phenomena of the boulders and detritus of 
Forfarshire, after the visit of Professor Agassiz resumed his 
examination, and having become convinced that glaciers 
existed for a long time in the Grampians, and extended into 
the low country, many of his previous difficulties were 
removed. The subject is not without its perplexities, for 
though on the one hand Mr. Lyell considers, from the evi- 
dence of fossil shells received from Canada, that the climate 
in the latitude of Quebec 36° 47", (corresponding with the 
central part of Switzerland,) was far more intensely cold at 
