630 
Proceedings of the Royal Society 
(3.) The Glen Creran boulders having been referred to in the two 
last Reports of the Committee, with a confession of uncertainty as 
to the source from which they had come, Professor Heddle, in com- 
pliance with my request, kindly undertook a renewed survey of the 
district. 
The result has been that the Professor has found rocks on the 
hills 4 or 5 miles from Glen Creran to the 1ST. hi. E. identical in com- 
position with the boulders. But how the boulders were carried from 
these hills, where the parent rocks are from 1700 to 2000 feet above 
the sea, to Glen Creran, which is only about 200 feet above the sea 
— i.e ., “ whether dropped from floating ice, or carried by glaciers,” 
“it is (observes the Professor), with our present information, impos- 
sible to say.” 
He found on the hills containing the rocks of the boulders nu- 
merous strice , which showed “ that some powerful smoothing and 
striating agent had passed over this district from the west, and at a 
level exceeding 2000 feet above the sea. But west from the place 
where these smoothed and striated rocks occur, there are no hills so 
high as to produce a glacier, unless, indeed, a glacier had come 
through Glen Tarbert, which is a continuation of Loch Sunart, and 
crossed what is now the Linnhe Loch. Loch Sunart and Glen 
Tarbert occupy a hollow in the district which runs in a direction 
about W.H.W. and E.S.E. 
“ It is, however (he says), proper to add that on the rock where 
these W.H.W. strise occur, there are cross striae overlying and cut- 
ting into these, indicating another and more recent agency from the 
S. W. These cross striae being more sharp and minute than the first, 
indicate more recent and less powerful action. Can it have been 
that a sea existed exceeding 2000 feet above the present level with 
ice in it, which was floating about in eddying currents among what 
are now high-peaked hills, tearing rocks out of the shallows, and 
pushing them over what were then submarine cliffs?” 
(4.) In this part of his notes applicable to the Glen Creran dis- 
trict, Professor Heddle refers to what he calls “ a boulder of the 
peculiar porcelain porphyry worked at Kentallen in Appin.” That 
it is a boulder is evident from the fact of the rocks of the hill where 
it Jies, being totally different. Its height above the sea is 2250 feet. 
How, porcelain rock of the same kind occurs among the Ben a 
