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 O' 6 mile, or 1056 yards, being per cent, of the length. 
The waters of the loch cover an area of 3059 acres (or 4| square 
miles), and it drains an area about eight times greater, or about 24,900 
FIG. ]. LOCH KATRINE AND ELLEN’s ISLE. 
(Pliotograijh hy J. Valentine.) 
acres (nearly 37 J 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 142J 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 l.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 thal 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 therefore not available for discussion (see also Art. “ Lake ” in 
Encycl. Brit.., 9th edit.). 
