THE FRESH-WATER LOCHS OF SCOTLAND. 9 



Achray) being 97 feet (16 fathoms). The bulk of water contained in the 

 loch is estimated at 217,000,000 cubic feet, and the mean depth at 36 

 feet (or 6 fathoms), being 37 per cent, of the maximum depth. The 

 length of the loch is 54 times the maximum depth, and 147 times the 

 mean depth. 



There are two depressions with depths over 50 feet : one at the 

 extremity of the western arm, about a quarter of a mile in length, 

 and the other filling up the greater part of the body of the loch, and 

 extending some distance up the north-eastern arm, being over one-third 

 of a mile in length and about one-quarter of a mile in maximum width. 

 The area over 50 feet in depth is estimated at 43 acres, or 31 per cent. 



FIG. 7. LOCHS VOIL AND DOINE, LOOKING WEST FROM EOB ROT S GRAVE, BALQUHIDDEB. 



(Photograph by J. Valentine.) 



of the total area of the loch, while the area between the shore and the 

 50-feet contour is estimated at 95 acres, or 69 per cent, of the area of 

 the loch. 



Lochs Voil and Doine. These two lochs, the surfaces of which, 

 according to the Ordnance Survey maps, are situated at an elevation of 

 414 feet above sea-level, formed at no very distant date a continuous 

 loch, which has been divided into two portions principally by the 

 deposition of material brought down Monachyle glen by the river ; this 

 is supported by the fact that deep water extends close up to the dividing 

 promontory of land on both sides. The former continuous loch must 



