Proc. Roy. Soc. Edin.\ 
[Vol. XXXYII 
Fig. 1 .— Valley of Allt nan Uamh, with denuded terrace of glacial drift in foreground. 
Limestone cliff with caves in middle distance. 
Fig. 2. — Allt nan Uamh looking east, with denuded terrace of ground-moraine in fore- 
ground. Limestone cliff with caves in middle distance. Quartzite mountain of 
Breabag in background. 
[Plate III. 
