202 



BATHYMETRICAL SURVEY OF 



the islands of Rum and Skye, so that to get a depth of 1000 feet one 

 must go west of St. Kilda and Ireland, beyond the 100-fathoms line 

 in the Atlantic ocean. There are no depths comparable to this in the 

 North Sea, but the submarine valley known as the "Norwegian Gut," 

 which runs round the west and south coast of Norway, is remarkably 

 deep, depths of 1794 feet (299 fathoms) and 1710 feet (285 fathoms) 

 having been obtained at the part called "The Sleeve." 



There are seven lakes on the continent of Europe which exceed 

 Loch Morar in maximum depth, and in the following table their 

 maximum depths, heights of the water surface above sea-level, and 

 depths of their floors below sea-level, are shown as compared with 

 Loch Morar. The first four of these lakes are in Norway, the other 

 three are well-known Italian lakes.* 



The Lake of Geneva, in which very important and comprehensive 

 limnological work has been done by Prof. Forel, Dr. Ed. Sarasin, and 

 others, has a maximum depth of 1013-8 feet, and the height of the 

 water surface is 1220-4 feet above sea-level; the deepest part of the 

 lake-floor does not, therefore, go below sea-level, but lies at 206-6 feet 

 above it. 



Temperature Observations. A large number of observations on the 

 temperature of the water of Loch Morar has been made in various 

 seasons and in different years. On April 29 and September 3, 1887, Sir 

 John Murray took several series of temperatures, ranging from the 

 surface to the bottom. In the April observations the temperature 

 varied from 43'9 at the surface to 42-0 at the bottom, a range of 

 1 0< 9, and in September the variation was from 57-8 at the surface to 

 42-l at the bottom, a range of 15-7. On July 2 and 3, 1902, serial 

 temperatures were taken by the Lake Survey, and the variation was 

 from 55-2 at the surface to 42-2 at the bottom, a range of 13-0. 

 Subsequently, on March 28, 1903, the temperature was found to be 



* The figures referring to these continental lakes are derived from " Halbfass, Die 

 Morphoraetrie der Europaischen Seen," Zeltschr. Gesellsch. Erdk. Berlin, Jahrg. 1903, 

 p. 592; 1904, p. 204. 



