632 
Proceedings of the Royal Society 
boulders, I am not satisfied that they supplied the boulders, — for 
the spots where those rocks occur, are only from 1500 to 2300 feet 
above the sea, — whereas the boulders on some parts of the Aonach- 
Eagach , to the eastward, were at a height of 3100 feet above the 
sea. 
“ An attempt has been made by some geologists to explain, how 
boulders may be transported to positions above the level of the 
parent rocks ; and, if that theory be correct, it may help to over- 
come this difficulty.” 
“ But it is a fact of considerable importance, bearing on any 
theory of transport, that these boulders on Aonach-Eagach , occupy 
/positions much higher in level than any of the hills in a very wide 
extent of country , so that it is hardly possible to adopt for them 
the explanation of any local glacier.” 
“ I have adverted ” (says the Professor) “to the peculiar position 
of these boulders on Meall Dearg , where, at a height of 3100 feet, 
they lay upon a ridge not many times wider than their own bulk, 
or rather on the sides of that ridge facing the E. or H.E. I am not 
able at present to offer any explanations of this feature. I would 
like again to study the position of these boulders. They must have 
been brought by ice , which may have come from the H.W. and stuck 
there among the high peaks, till it melted and allowed the boulders 
to subside on or near the top of the ridge. My explorations about 
Glen Creran, led to the supposition of a flow of ice through Glen 
Tarbert on the H.W. side of the Linnhe Loch. This might also 
possibly account for the boulders on Aonach-Eagach ; but, in that 
case, where could the parent rocks be 1 ” 
This query by the Professor, Where could the parent rocks of 
these boulders be? he leaves unanswered; and, no doubt, it is a 
query more easily asked than answered. It would, therefore, be 
presumption in me even to suggest an answer. But the query 
reminds me that, two years ago, I sent specimens of the Loch 
Creran boulders to Professor Judd of London, an eminent geo- 
logist well acquainted with the rocks of the West Highlands, to 
ask him, whether he knew of rocks anywhere like those of the 
boulders, and he gave a decided opinion that rocks of exactly the 
same kind existed in Mull and Ardnamurchan. How, these places 
are to the west of the boulders referred to by Professor Heddle, and 
