GLEN ROY, IN SCOTLAND. 
61 
must have been removed, for the lowest ter¬ 
race, as I have said, is continuous throughout 
the eastern part of Glen Spean.* 
* Having enumerated the characteristic features of the 
glacial phenomena in the preceding pages, I throw into this 
note some explanations which may render my views of the 
parallel roads more intelligible, not to interrupt again the 
exposition with details. It would be desirable, however, that 
the reader should first make himself thoroughly familiar with 
the localities concerned before proceeding any further. The 
woodcut on page 58 is taken from a small map, accompanying 
a paper of mine upon ‘ ‘ The Glacial Theory and its Recent 
Progress,” printed in the “Edinburgh New Philosophical 
Journal” for October, 1842. G. R. indicates the valley of 
Glen Roy, with the three parallel roads marked 1, 2, 3. Glen 
Spean is designated by G. S., and the river flowing at its 
bottom by S. Loch Laggan, out of which the river Spean 
rises, is marked L. G. indicates Glen Gloy, a little valley 
to the northwest of Glen Roy, with a single terrace. Loch 
Treig is designated by T., Loch Locliy by L. 0., Loch Ark- 
eig by A., and Moeldhu Hill by M., while E. indicates Loch 
Eil. The Great Glen of Scotland, through which the Cale¬ 
donian Canal runs, extends in the direction of L. 0. and E. 
The position of Ben Nevis is designated by N. The dotted 
area between N. and M. marks the place occupied by the 
great glacier of Ben Nevis, when it extended as far as Moel- 
dhu ; while the close continuous lines in front of Loch Treig 
indicate the direction of the glacial scratches left across Glen 
Spean by the glacier of Loch Treig, when it extended as far 
as the eastern termination of the two upper terraces. It 
ought to be remembered, in this connection, that the bottom 
