994 Proceedings of Royal Society of Edinburgh. [sess. 
this remark. The marsh about the embouchure of the rivers is 
more under the influences mentioned, and here the mud is of the 
black and fetid kind (p. 969). The accompanying photographs 
illustrate some of the features of the marsh vegetation here. Fig. 17 
affords an idea of the sandy shore and its vegetation at the south of 
the bay. The two rivers enter Loch Ness through the wood seen in 
the middle distance. Fig. 18 shows one of the rivers passing through 
the wooded marsh. Owing to the dense vegetation, the light here 
is very weak ; under the same conditions of sky, i.e. overcast, the 
negative for this photograph received thirty times the exposure of 
that for fig. 17, viz., half a second and 15 seconds respectively. 
This is of course a somewhat hap-hazard method of measuring light 
intensity, but it agrees closely with the results obtained by J. Wiesner 
with special apparatus. Wiesner * found the light under a spruce- 
tree to be about of the intensity of that in the open. 
Fig. 19 presents a marsh view near the mouth of the rivers, looking 
out towards the bay. Fig. 20 represents a group of Alisma Plantago, 
a plant of rare occurrence in this area. Passing out of Urquhart Bay, 
there is very little more regarding aquatic flora to arrest our atten- 
tion in Loch Ness. At the north-east end of the loch, from Lochend 
to the lighthouse at the entrance to Loch Dochfour, there is a re- 
markably large high stony beach (fig. 21). During westerly gales, 
the waves, gathering strength from the whole length of the loch, 
break with great force upon this beach ; which resembles, but on 
a much smaller scale, the noted Chesil Beach in Dorsetshire. The 
pebbles for the photograph (fig. 2) were gathered here. At Dores 
Bay a similar but smaller and less stony beach may be seen. 
Fig. 22 affords an illustration of the shore at Inverfarigaig 
which is typical of this portion of the loch. In wet situations, 
throughout the eastern shore of Loch Ness, are large quantities of 
Scutellaria galericulata (fig. 23). A few aquatic plants are found 
in Foyers Bay, but only such as have been already mentioned as 
common to the loch ; neither is there any abundance of aquatic 
vegetation here. The bay has been formed by detrital matter 
brought into the loch by the river Foyers. Fig. 24 will give 
some idea of the extent of this delta. So great has been the 
* “ Photometrische Untersuchungen auf pflanzenphysiologischem Gebiete,” 
Erst Abh., Sitzungsberichte der Wiener Akademie , Bd. cii., Abth. I., 1893, etc. 
