THE FRESH-WATER LOCHS OF SCOTLAND. 347 



sounding in 104 feet was taken about 120 feet from shore; a little 

 farther east another sounding in 50 feet was taken about 50 feet from 

 shore; still farther east a sounding in 148 feet was taken about 120 

 feet from shore ; and still farther east a sounding in 87 feet about 

 60 feet from shore. The last-mentioned sounding, which gives a slope 

 of 29 in 20, was taken on the cross-line immediately to the east 

 of the deepest sounding, and the steepest gradient observed off the 

 northern shore was at the opposite end of the same line, where a 

 sounding in 54 feet was taken at about 60 feet from shore. The cross- 

 section C-D on the map is taken at the position of the deepest sounding, 

 and shows a gentle offshore slope, succeeded by a steeper slope on 

 proceeding into deep water, the deeper part of the loch being of a 

 flat-bottomed character. The area enclosed by the 50-feet contour is 

 nearly 3 J miles in length, being distant from the west end nearly three- 

 quarters of a mile, and extending into the narrow part at the east end 

 off Creag Ghrada ; in the expansion of the out-flowing river, opposite 

 Creag Dubh, a depth of 64 feet was observed. The 100-feet basin 

 is 3 miles, the 150-feet basin 2J miles, and the 200-feet basin over one 

 mile, in length. The approximate areas between the consecutive 

 contour-lines drawn in at equal intervals, and the percentages to the 

 total area of the loch, are given in the following table, from which 

 it will be noticed that the area of the zone between 150 and 200 feet is 

 larger than that of the two preceding shallower zones : 



Oto 50 feet 293 acres 39 per cent. 



50,, 100 134 18 



100,, 150 99 13 



150,, 200 138 18 



Over 200 86 ,, 12 



750 100 



Temperature Observations. The following series of temperatures, 

 taken in the deepest part of the loch at 4 p.m. on the date of the survey, 

 shows that the whole body of water varied little in temperature, being, 

 in fact, uniform in temperature down to 100 feet, the extreme range 

 amounting to only l-2 Fahr. 



Surface 49'5Fahr. 



10 feet 49-5 



25 49-5 



50 49-5 ,, 



100 49'4 



150 , 49'0 



170 48-5 ,, 



200 48-3 



Lurh a Mhuilinn (see Plate LXXXII.). Loch a' Mhuilinn (or 

 Moilie) is a small irregular loch lying about 5 miles to the east of Loch 



