THE FRESH-WATEK LOCHS OF SCOTLAND. 3 



laid down by the Allt Smeoral projects into the loch, the deepest water to 

 the south-east being 59 feet, and to the north-east 64 feet, while on the 

 shoaling the greatest depth observed was 50 feet. There are two 50-feet 

 basins : the larger, in the most northerly expansion of the loch, is three- 

 quarters of a mile in length, and the smaller, in the third expansion from 

 the foot of the loch, is one-third of a mile in length. The areas between 

 the contour-lines, and the percentages to the total area of the loch, are 

 as follows : 



Feet. Acres. Per cent. 



Oto25 376 ... 67-2 



25 50 130 ... 23-2 



over 50 54 9'6 



560 100-0 



Temperature Observations. Several readings at the surface on the date 

 of the survey gave a range of 1'5 Fahr., from 44'3 to 45'8, and a series 

 taken in the deepest part of the loch at 4-15 p.m., gave the following 

 results : 



Surface 45 c -8 Fahr. 



10 feet ! 45-8 



20 46-0 



45 45-0 



65 45-0 



This series shows a range of only 1 from surface to bottom, while 

 lower readings were recorded at the surface than beneath the surface, so 

 that the body of water was evidently in process of being cooled down from 

 the summer maximum to the winter minimum. 



