2 BATHYMETRICAL SURVEY OF 



woodland scenery of the Trossachs and Ellen's isle are situated at its 

 south-eastern end, while splendid moorland scenery prevails at the north- 

 western end. It has a total length of about 8 miles, with a maximum 

 width of almost exactly 1 mile between the mouths of Letter burn and 

 Strone burn on the northern shore to a small bay on the opposite shore. 

 The mean breadth, obtained by dividing the area of the loch by its 

 length, is 0'6 mile, or 1056 yards, being 7J per cent, of the length. 



The waters of the loch cover an area of 3059 acres (or 4f square 

 miles), and it drains an area about eight times greater, or about 24,900 



FIG. 1. LOCH KATRINE AND ELLEN'S ISLE. 



(Photograph by J. Valentine.) 



acres (nearly 37 \ square miles). * The total number of soundings taken 

 in Loch Katrine was 775, an average of 163 per square mile, and the 

 average depth of these was 142 J feet, the greatest depth observed being 

 495 feet (82 J fathoms). f The positions of the majority of the soundings 

 are shown on Plate IV. 



* When the waters of I.och Arklet are diverted into Loch Katrine this drainage area 

 will, of course, be extended. 



f As long ago as September, 1812, and September, 1814, Mr. James Jardine, C.E., 

 recorded observations on the depth and temperature of Loch Katrine (see Buchan, Proc. 

 Roy. Soc. Edin., vol. vii. p. 791, 1872). The maximum depth recorded by him is 480 

 feet (80 fathoms), whereas, as stated above, we found a depth of 495 feet. His tempera- 

 ture observations are given in the table of serial temperatures, and discussed along with 

 the recent observations. We believe that Mr. J. Y. Buchanan took soundings and tem- 

 peratures in Loch Katrine some years ago, but, as far as we are aware, they were 

 never published, and are therefoi'e not available for discussion (see also Art. " Lake " in 

 Encycl. Bi-it., 9th edit.). 



