736 Proceedings of the Royal Society 
plained by the system now existing in Greenland. There, a 
vast system of Continental ice, as great in area as all India, 
radiates seawards, and launches icebergs, which move about 
in tides and currents. This system certainly existed in Scot- 
land previous to the smaller system. 
“ Following any glen in Scotland, say Glenfyne, the smaller 
system of glaciation follows the course of the river (as in 
Switzerland), and the course of the tides in the sea loch (as 
glaciers do in Greenland) ; and, furthermore, often overruns 
low watersheds, and runs out to sea in some direct line. The 
striae which mark the run of ice from the head of Glenfyne to 
Lochgilphead, run over a col and down Loch Killisport. They 
run past Tarbert, down both sides of Ceantyre and Arran, and 
out to sea. At Ormsary, by the roadside, and on the sea-beach, 
is a train of large boulders to which the usual legends are 
attached. One was thrown from Knapdale at a giant who was 
eating a cow on the other side of the loch. One of these 
boulders close to Ormsary House, at a small roadside cottage, 
is the biggest I have seen in Scotland. I did not try to 
ascertain whence it came. I think it was pushed a short dis- 
tance only. But the striae and trains of blocks show that it 
moved from N.E. to S.W. along the general line of hollows in 
the Western Highlands. 
“ On the outer islands in Scotland are marks equivalent 
to those so conspicuous on shore. In the Long Island, from 
Barra Head to the Butt of Lewis, the whole country glaciated, 
and the boulders everywhere perched upon the hills. Where 
surface newly exposed, the striations and smooth polishing so 
perfect and fresh, that marks can be copied as brasses are copied 
in churches by antiquaries. I showed to you samples taken 
last year in Barra and Uist. I have a large series taken 
wherever I have wandered. These enable me to say, with 
tolerable certainty, that the ice which grooved rocks in Outer 
Hebrides at low levels, near sounds, moved from the ocean in 
the direction which tides now' follow in the straits, beside 
which the striae are found. For example, the grooves upon the 
flat at Iochdar, at the north end of South Uist, aim directly 
at the Cuchullin Hills in Skye. At the Mull of Ceantyre, at a 
