THE FRKSH-WATER LOCHS OF SCOTLAND. 



393 



loch, 154 feet, and near the other end of the area there is a sounding of 

 129 feet, with a depth of only 108 feet between them. The second 50- 

 feet area is half a mile south-west of the river Garry, and is marked by 

 an isolated sounding of 57 feet. The third 50-feet area begins half a 

 mile from the south-west end, and extends down the loch for a mile. It 

 is the largest basin in the loch, but not so deep as the more northerly 

 one, the greatest depth in it being 133 feet. The fourth 50-feet area 

 is close to the upper end of the loch. It is one-third of a mile long, 

 and is scarcely separated rom the larger one, as they are close together, 

 and the depth between is 48 feet. In this fourth basin the greatest 

 depth is 84 feet. 



FIG. 61. LOCH OICH, LOOKING SOUTH-WEST; C ALDER BURN IN THE FOREGROUND. 



(Photograph by Mr. G. Went. From " Proc. Roy. Soc. Edin.," by permission of the Council.) 



Temperature Observation*. The following serial temperatures were 

 taken in the deepest part of the loch, series I. on May 1, 1903, and 

 series II. on September 25, 1903 : 



Surface 



10 feet 



20 



30 



40 



50 



60 



70 



80 



90 

 100 

 120 

 130 



i. 

 44 9 

 44 -9 



44 -x 



II. 



55 -0 Fahr. 

 54 -0 

 54 -0 

 54 -0 

 53 "8 

 53 -8 

 53 8 

 53 -8 

 53 -0 

 51-9 

 49 '8 

 48^-8 



