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hearing a graphic description of the phenomena in Scotland 
to which I have briefly alluded ; and when at Alston, I read 
with Dr. Buckland the Report of Professor Locke on the 
State of Ohio, in which he not only describes grooves and 
scratches precisely similar to those alluded to, but also gives 
a relief engraving of a specimen which leaves no doubt of 
its identity. Professor Locke says, that " the rectilinear 
course of these grooves corresponds with the motions of an 
immense body, the momentum of which does not allow it to 
change its course on slight resistances." It is at once evi- 
dent that this description is exactly correspondent to the 
effects of glacial action ; and it shows very clearly how 
strong an evidence is afforded by the mere physical condi- 
tions of the grooved and polished stone ; for it would be 
impossible more correctly to describe the action of the 
glacier as witnessed by Agassiz, and recorded, there is much 
reason to conclude, on the rounded, and grooved, and fur- 
rowed rocks of Great Britain, as legibly as upon the rocks 
which in Switzerland are in juxta-position with existing 
glaciers. I forbear to speak of the observations made in the 
North of England by Dr. Buckland, because I trust in the 
course of the summer he will fulfil his intention of resuming 
the examination of the Cheviots and North and South Tyne, 
when the whole can be better explained by means of maps 
and diagrams, than it can by mere description. 
During my journey with Dr. Buckland in October, 1840, 
he pointed out the most likely places for searching in order 
to discover traces of glacial action, and was about to examine 
the rocks in a quarry at Langley, when we were deterred by 
the quarrymen being on the point of firing a blast. On a 
recent visit which I made to this place, the workmen had 
just bared a considerable breadth of surface, and on washing 
it, the long lines of grooving were quite visible in a direction 
parallel with the valley, and the polish afforded a clear view 
