THE IIIVER DEE. 
549 
which opens into Glen Chmy, about two miles from Castle- 
town. The highest summit of this group is Loch-na-gar, 
which consists of granite, as do the other masses in the 
vicinity. The eastern side of Glen Callader, on the con- 
trary, consists of gneiss and mica-slate. The granitic 
mountains to the north of the Dee are scantily clothed with 
vegetation, owing to the disintegration of the rock, which 
has covered them with stones and gravel. Loch-na-gar, 
and especially the mountains around it, being composed of 
harder rock, have a considerable covering of peat, and a 
more luxuriant vegetation, although their summits are still 
exceedingly bare. Glen Callader is still better furnished 
with vegetation; the rills and streams from the whole of 
this group are more or less tinged with brown. In Glen 
Callader there is a lake about a mile in length, in which, 
among other aquatic plants, I observed Lobelia Dortman- 
7ia, Subularia aguatica, and Myriopliyllum verticillatum. 
The Corry of Loch Ceanndin, at the head of this valley, 
produces a great number of alpine plants, among which I 
observed Veronica alpina, Veronica hiimifusa^ Alchemilla 
alpina, Sibbaldia procumbens, Gnaphalium supinum, Saoci- 
fraga stellaris^ S. oppositijblia, Poa alpina, Festuca vlvi- 
para, Rliodiola rosea^ Polygonum viviparum^ Cerastiuni 
latifolium, Juncus trifidus^ Juncus triglumis, Poa alpina^ 
Saxifraga hypnoides, Salix herbacea, Luzula spicata, Sa- 
lix Stuartiana, and a supposed new species which I have 
named Salix Macnabiana. The alpine variety of Ranun- 
cuius acris is here very abundant, and Geranium sylvati- 
cum and Trollius europcBus grow on the rocks. 
In crossing the mountains from Loch Callader to the 
head of Loch Muic, I found the same plants generally as 
those which occur to tlie north of the Dee. The Duloch, 
between the Craigs of that name, is entirely destitute of 
vegetation. Loch Muic itself is scantily supplied, although 
