108 BATHYMETRICAL SURVEY OF 



the many islands there are numerous large boulders projecting above the 

 surface of the loch. The surface on October 25, 1906, was 264'6 feet above 

 sea-level, and fully 16 feet higher than Mochrum Loch; the elevation 

 found by the Ordnance Survey on April 15, 1893, was 264*2 feet above 

 the sea. The temperature was 48*0 Fahr. throughout. 



Mochrum Loch (see Plate XLL). The Mochrum Loch, the largest in 

 the basin, is situated nearly midway between the towns of Wigtown and 

 Glenluce. It is of very irregular form, with rocky shores and many 

 rocky islets, the largest of which are covered with trees. Westward to 

 Castle Loch stretches flat boggy moor, on the east is cultivated ground and 

 woods. The length is 1 J miles, and the greatest breadth nearly one-third 

 of a mile. The depth is very low (mean 7 feet, maximum 13 feet), the 

 bottom in the open parts of the loch nearly flat or gently undulating. 

 The area is about 230 acres, or one-third of a square mile, and the volume 

 of water 68 millions of cubic feet. The drainage area, including Castle 

 Loch, is about 4 square miles. The only considerable feeder is the burn 

 coming from Castle Loch. The Water of Malzie issues from the east side 

 of the loch, and flows some 5 or 6 miles in an easterly direction to join 

 the river Bladenoch. On the date of the survey, October 24, 1906, the 

 surface was 248*15 feet above sea-level; the elevation determined by the 

 Ordnance Survey on March 27, 1893, was 247*7 feet above the sea. 



The temperature was 48 -4 Fahr. at the surface, and 48'0 at 10 feet. 



