GLEN ROY, IN SCOTLAND. 
73 
snow, they have disappeared as completely as 
in the Grampian Hills. 
It would lead me too far, were I to give here 
a special account of all the investigations I 
made in 1840 upon the distribution of glaciers 
in Great Britain. I will therefore only point 
out a few of the more distinct areas of distri¬ 
bution. The region surrounding Ben Wyvis 
formed such a centre of dispersion from which 
glaciers radiated, and we have another in the 
Pentland Hills about Edinburgh. In Nor¬ 
thumberland, the Cheviot Hills present a gla¬ 
cial centre of the same kind, and in the West¬ 
moreland Hills we have still another; In the 
last-named locality, the glacial tracks can be 
followed in various directions, some of them 
descending toward the northwest from the 
heights of Helvellyn, others moving southward 
toward Ambleside. In Wales the same kind 
of glacial distribution has been observed; but, 
as Professor Ramsay has treated this subject 
in full, I would refer my readers to his mas¬ 
terly work for a further account of the ancient 
Welch glaciers. In Ireland I had also oppor¬ 
tunities of making extensive local investiga¬ 
tions of glacial action. I observed the centres 
4 
