THE FRESH-WATER LOCHS OF SCOTLAND. 



65 



looked upon as a distinct lake, but in the foregoing description the two 

 lakes have been regarded as one. Many temperature observations were 

 taken in Loch Laidon on April 9, 10, 14, 15, and 25, the surface 

 readings varying from 38'8 at 5 p.m. on the 9th to 48 0- 2 at the head of 

 the loch at 1 p.m. on the 10th a range of 9-4 in the temperature of 

 the water, while the range in the air-temperature during the same 

 period was only 5 (from 45-2 to 50-2). Two serial temperature 

 observations were taken in the centre of the loch, the first at 5 p.m. on 

 April 9, when the readings were identical (39-8) at the surface and at 

 depths of 5 and 25 feet, the second at 5.20 p.m. on the 10th, when the 



FIG. 18. LOCH LAIDON. 



(Photograph by Miss Marynret Murray.) 



surface readings were 39-8 and 41, that at 5 feet 39'7, and that at 

 20 feet 39 0> 4. The surface temperature in Dubh Lochan on April 14 

 was 43-9. 



The western arm of Loch Laidon receives the waters from a small 

 loch (Lochan Gaineamhach) lying about 2 miles to the west. This 

 loch, and the neighbouring "one to the north, were visited on May 20, 

 1903, but, as there were no boats on tjiem, they were not sounded. 

 They were found to be of the same general character as the other lochs 

 of Rannoch Moor shallow, with stony shores, containing boulders 

 and islets, some of the latter with small trees on them. In Lochan 

 Gaineamhach, weeds were seen only in some very small bays, but in 



