of Edinburgh, Session 1880-81. 
285 
time for them in vain. A cairn on the summit, apparently the 
work of the Ordnance surveyors, showed nought but quartz, the 
sharply angular debris of which strewed the protruding edges of the 
strata. Searching about among the quartz debris , I did, however, 
find on the very top of the hill a small lump or two of the 
same porphyry ; and other fragments of it occurred as I descended 
the shoulder of the mountain.” 
(3.) In his paper “ On the last Changes of Scotland” (“ Quart. 
Journ. of Lond. Geol. Soc.” for 1865, p. 165), Mr Jamieson states, 
that “ the detached mountain of Schehallion (Perthshire), 3500 feet 
high, is marked near the top as well as on its flanks, and this not by 
ice flowing down the sides of the hill itself, but by ice pressing over 
it from the north. On the top of another isolated hill, Morven, 
about 3000 feet high, situated a few miles to the north of Ballater 
(Aberdeenshire), I found granite boulders unlike the rock of the hill, 
and apparently derived from mountains to the west. 
“Again, on the highest watersheds of the Ochils (a range of trap- 
hills stretching from Stirling towards Perth), at altitudes of about 
2000 feet, I found pieces of mica schist full of garnets, which seem 
to have come from the Grampian Hills to the north-west, showing 
that the transporting agent had overflowed even the highest parts 
of the Ochil ridge. 
“ On the Perthshire hills, between Blair- Athole and Dunkeld, I 
found ice- worn surfaces of rock on the tops of hills, at elevations of 
2200 feet, as if caused by ice pressing over them from the north- 
west, and transported boidders at even greater heights.” 
Referring to boulders in brick-clays, Mr Jamieson (p. 178) 
mentions that in “the Paisley brick-clay, which abounds in sea- 
shells (all of them Arctic), boulders of from 1 to 3 feet in length 
are not uncommon. I saw one 6 feet in length. Many of them 
show the glacial striae. These boulders occur imbedded here and 
there at various depths. It is common to find a crust of Balani 
attached to one of these boulders. It has generally been supposed 
that the Balani are confined to the upper surface and sides of the 
stone, as if they had grown upon it after it had been dropped into 
its present position. I satisfied myself, however, that this is not 
always the case, for I found that Balani do occasionally occur all 
over the lowermost side. For example, I observed one heavy stone, 
