631 
of Edinburgh, Session 1879-80. 
Bheitlier hills at exactly the same height above the sea, about mid- 
way between two other hills whose names are given, 3 or 4 miles to 
the N.N.W. 
Assuming that the boulder came from that point, it must have 
crossed two valleys, each of which is less than 700 feet above the 
sea. How it could have crossed these, except on floating ice, it is 
difficult to see. 
(5.) There is another boulder in the same district of Schistose 
Breccia at a height of 2235 feet. The parent rock was found at some 
distance to the N’.N.W. “This boulder (the Professor says) in like 
manner must have been carried across the deep valley of the Durer 
to have reached its present position.” 
(6.) A very interesting account is given of boulders in the neigh- 
bourhood of Glencoe. Being much rounded, they suggest a long 
transport, and were “ of a peculiar granite,” somewhat like “ the 
well-known Ardshiel granite,” only “whiter and coarser grained.” 
Being “ altogether different from the rocks of the hill on which 
they were first noticed, consisting of a ‘ schistose breccia,’ the Pro- 
fessor resolved to seek for the parent rock.” 
Thinking, from his knowledge of the rocks to the eastward, that 
they were not likely to have come from that quarter, he set out on 
a hunt in a westerly direction. On reaching the Aonach-Eagach 
range of hills, he recognised the same boulders on them, “fewer in 
number, but markedly larger in size.” 
He followed them up to the first summit of the hill, which was 
2938 feet; and, proceeding still further west to a hill called Meall 
Dearg , he found the same boulders first at 3090 feet and eventually 
“almost up to the summit of the western peak at 3118 feet.” 
The Professor says that “ their position here was most peculiar, — 
they lay upon a ridge not many times wider than their own bulk, 
and only on the eastern slopes of that ridge.” 
Proceeding still farther west to other hills (which are named in 
his notes) at from 2400 to 3200 feet, the Professor did not find 
either boulders, “ or rock, of the same description ; ” but on proceed- 
ing to the next hills, of somewhat greater height, about 6 or 7 miles 
to the west, he found at two spots, the kind of rock he was in quest 
of. He however adds, that “ though the rocks at these two spots 
were almost identical in mineral composition with that of the 
4 F 
VOL. x. 
