98 
Proceedings of the Royal Society of Edinburgh. 
Sess. 
VIII. — Temperature Observations in Loch Garry (Inverness-shire). 
With Notes on Currents and Seiches. By E. M. Wedderburn, 
LL.B., W.S. 
(MS. received November 2, 1908. Read November 2, 1908.) 
During the first seven months of the year 1908 I had the good fortune to 
be living at Invergarry in Inverness-shire, with sufficient time at my disposal 
to make temperature observations in Loch Garry, and, through the generosity 
of Sir John Murray and Mr Laurence Pullar, the funds of the Lake Survey 
(Pullar Trust) were put at my disposal to defray the expenses of observa- 
tion. I was further fortunate in securing the services of Mr Wm. Macdonald, 
Mount Pleasant, Fort Augustus, who was previously boatman to the Lake 
Survey on Loch Ness, and who proved himself a most painstaking and eager 
observer, and by whom by far the greater number of the actual observations 
were made. 
One reason for my anxiety to obtain observations in Loch Garry was that 
it is a lake of the temperate class, of considerable size, and fairly uniform 
basin. A description of the lake will be found in the Lake Survey 
Reports, Geographical Journal , vol. xxx. p. 401, October 1907. The lake is 
divided into two parts. The main part of the loch is about 4 miles long, 
and is a simple basin with a maximum depth of about 220 feet. At the 
eastern end there is a shallow basin cut off from the main loch by a large 
promontory ; the channel between the two basins is very narrow, and is so 
shallow that when the level of the loch is low it is difficult to get a rowing 
boat from one basin to the other. This smaller basin, which is about a 
mile in length, is little over 40 feet deep, and in summer large portions of 
it are covered with weeds. Nearly all the observations were made in the 
main basin, but occasional observations were made in the small loch for 
the sake of comparison, and no noteworthy differences in temperature 
between the basins were observed. 
The chief point of interest in the observations was to discover whether 
temperature changes similar to those found in Loch Ness occurred in such 
a body of water as Loch Garry. The presence of the temperature seiche in 
Loch Ness has been fully established, but it was considered doubtful 
whether a temperature seiche could occur in a lake of moderate length and 
depth such as Loch Garry. 
It was hoped that further use could be made of the electrical installation 
