386 Proceedings of the Royal Physical Society. 
Associated with the quartzite is a band of limestone which 
crops out here and there along the line between Loch Broom 
and the head of Loch Kishorn. The outcrops are generally 
interrupted and of little breadth, and it is only along the 
eastern side of Glen Kishorn that this rock covers any extent 
of ground. But wherever it occurs there is an immediate 
change in the character of the country. Rich herbage and 
an abundance of flowering plants, many of which are peculiar 
to a limestone soil, clothe the ground; insect life swarms, 
and there is a corresponding increase in the number and 
variety of the smaller birds, especially of those species which 
are insectivorous. It is a great contrast to pass from the 
barren quartzite ridges that rise above Glen Kishorn, where 
the Ptarmigan’s croak and the hoarse bark of the Raven are 
the only sounds to be heard, to the lower limestone slopes, 
rich in vegetation, where the air is filled with the incessant 
notes of Wheatear and Whinchat, and diversified by belts of 
natural wood resounding with the song of Thrush and Black- 
bird, Redstart, Willow-Wren, and Tree-Pipit, and the calls of 
Cole-Tits and Chaftinches. 
3. The Eastern Schist Zone-—The eastern schists fringe 
the eastern side of the Dundonnell area, and extending 
southwards, occupy the greater part of Strathcarron and 
Lochalsh. Composed chiefly of different varieties of 
quartzose and micaceous schist and gneiss, they are generally 
richer in alumina than the rocks to the west, and conse- 
quently yield more readily to atmospheric weathering, with 
an accompanying production of a thin soil of sandy clay. 
The country where these rocks occur is therefore for the 
most part fairly well clothed with grass and heather. 
Our acquaintance with this part of West Ross is at present 
very limited, but it will probably be found that the bird-life 
in this region approximates more closely to that of the 
heathery moorlands of the Central and Eastern Highlands. 
Glaciation.—Nowhere in Scotland are the traces of the 
Glacial Period more distinctly marked than in the area 
under consideration, and especially in Torridon, Applecross, 
and the western side of Strathcarron. The great ice-sheet, 
travelling seawards from a centre of dispersion that lay con- 
