58 



BATHYMETRICAL SURVEY OF 



following table, and those taken in Loch Ericht are shown graphically 

 in the temperature section (Plate XIV.), since they are extremely 

 interesting as illustrating the effect of the wind upon the distribution 

 of temperature : 



Loch Ericht. Like Loch Katrine, Loch Ericht is said never to freeze 

 over, and the surface temperature remains comparatively low through- 

 out the summer. The surface temperatures taken in Loch Ericht 

 during the visit from 15th to 20th June show a range of 10'4, viz., 

 from 46- 6 to 57 ; the higher temperatures were obtained towards the 

 northern end of the loch, and the lower temperatures towards the 

 southern end of the loch. A glance at the temperature section (Plate 

 XIV.), based upon the observations given in the table, shows that the 

 warmer water was all collected towards the upper end of the loch, as 

 the result of a south-easterly wind which blew at times during the six 

 days that were devoted to the survey of the loch, colder water having 

 been drawn up at the opposite end of the loch to supply the place of the 

 warmer surface water driven before the wind. 



Loch Garry. Loch Garry was visited on the 21st June, 1900, when 

 the surface temperature was found to vary from 57 at the south-west 

 end to 59'4 at the north-east end, and this would seem to indicate a 

 distribution of temperature similar to that observed in Loch Ericht, 

 but since only one temperature series was taken, it is impossible to form 

 an idea of the distribution of temperature throughout the whole body 

 of water. 



