1904 - 5 .] 
Flora of Scottish Lakes. 
993 
gravel, and covered with a vegetation exhibiting more or less 
xerophilous characters, Erica, Myrica, Calluna, Juniperus, Betula, 
and Pteris being the dominant forms, encroaching in patches over 
the beach from the adjacent moor (fig. 15). Leaving this bay, we 
meet with scarcely any aquatic flora except such as may occur in little 
bays (p. 986) until Invermoriston is reached. Here again there 
is a paucity in the variety and quantity of aquatic plants, nothing 
calling for special remark. The erosive power of the waves upon 
the shore here is shown by the washing away of the soil from the 
roots of trees on the littoral, as seen by fig. 16. 
From Invermoriston to Urquhart Bay, a distance of some 10 
miles, there is absolutely nothing in the way of aquatic flora to 
demand attention. In Urquhart Bay, however, conditions prevail 
similar to those of Inchnacardoch Bay, the bottom being of firmer 
sand. The aquatic plants are similar, with the following excep- 
tions : — Polygonum amphibium more abundant, and Potamogeton 
polygonifolius abundant at the mouth of the river Enrick, and 
not found anywhere else in Loch Hess. Regarding the marsh or 
semi-aquatic plants, those of Inchnacardoch Bay are also repre- 
sented here, with the exception of Carex elata. There are also 
several additions for Urquhart Bay : — Mentha sativa, var. rubra ; 
Mentha arvensis, var. agrestis ; Sparganium ramosum, Alisma 
Plantago, Scrophularia aquatica, Cnicus heterophyllus, Polygonum 
Hydropiper, Polygonum amphibium, terrestrial form, Salix alba, 
and Veronica Beccabunga, a small depauperated form. These 
additions may no doubt be accounted for by the less peaty con- 
dition. At Urquhart Bay two rivers enter Loch Hess, the Enrick, 
draining the populous and highly cultivated Glen Urquhart, and 
the Coiltie, from Balmacaan Forest, which also drains a consider- 
able area of cultivation. The nitrogenous substances ; and lime 
from a district north of Glen Urquhart, brought down by these 
rivers, undoubtedly, to a certain extent, extinguish the action of 
the humic acids. Again, a considerable marsh delta has been 
formed here, and upon it there is a luxuriant vegetation of the 
woodland type ; the mild humus of this has also to be borne in 
mind. The water of the bay, owing to the great bulk of the loch, 
is probably but very little if at all reduced in peatiness; the 
similarity of the vegetation to other portions of the loch bear out 
PROC. ROY. SOC. EDIN. — YOL. XXV. 63 
