THE FRESH- WATER LOCHS OF SCOTLAND. 327 
3 p.m. on the date of the survey in the deepest part of the loch, with 
the following results 
Surface . . . 
54° -6 Fahr. 
5 feet ... 
54° -6 „ 
10 „ ... 
• •• 
54° -5 „ 
25 „ ... 
54° -2 ,, 
50 ,, ... 
54° -0 „ 
100 ,, ... 
53° *3 „ 
120 „ ... 
53° 0 ,, 
135 „ ... 
52°T ,, 
150 ,, ... 
49° -2 ,, 
This series shows a range from surface to bottom amounting to 
5°*4, The upper layers of water are practically uniform in temperature, 
the decrease from the surface down to 50 feet being only 0°-6, down to 
100 feet 1°*3, and down to 120 feet 1°*6, whereas between the depths 
of 120 and 150 feet the fall of temperature was 3°-8. It was stated 
that the loch freezes all over in winter. 
The details regarding the lochs in the Naver, Borgie, Kinloch, and 
Hope basins are collected together in the table on p.326 for convenience 
of reference and comparison. From this table it will be seen that in the 
eleven lochs under consideration over 1400 soundings were taken, and 
that the aggregate area of the water surface is over 11 square miles, so 
that the average number of soundings per square mile of surface is 127. 
The aggregate volume of water contained in the lochs is estimated at 
about 15,600 millions of cubic feet. The area drained by these lochs 
is about 239| square miles, or twenty-two times the area of the lochs. 
Notes on the Geology of the District Between Loch Hope and 
Strath Naver. 
By B. N. Peach, ll.d., f.r.s., and J. Horne, ll.d., f.r.s. 
The district extending from Loch Hope to Strath Naver, in the 
north of Sutherland, has not yet been wholly mapped by the Geological 
Survey. 
The north-western tract, embracing the lower part of Loch Hope, 
comes within the belt of territory affected by the Post-Cambrian move- 
ments to which reference has been made in the description of the geology 
of the districts of Loch Assynt and Loch Maree.* Hence, on the hill- 
slopes on either side of the river Hope, we find various subdivisions of 
See pp. 178 and 233. 
