158 BATHYMETRICAL SURVEY OF 



constriction is shallow and obstructed by weeds ; a small area exceeding 

 10 feet in depth runs along the southern shore, the maximum depth 

 therein being 13 feet. The wide portion of the loch to the south-west of 

 the constriction forms a regular deep basin, the maximum depth of 39 

 feet being found in the north-eastern part of the basin. The areas at 

 different depths, and the percentages to the total area of the loch, are 

 as follows : 



to 10 feet 35 acres 65 '8 per cent. 



10 25 12 23-2 



Over 25 , 6 , 11 -0 



53 , 100-0 



Loch an Tuirc was surveyed on September 17, 1902, but the elevation 

 of the lake-surface above the sea could not be determined ; the elevation 

 is apparently slightly under 200 feet. Temperature observations at 

 3 p.m. gave identical readings of 53'0 at the surface and at depths of 

 20 and 30 feet. 



