Loch Lomond during the Autumn of 1885 323 



15 fathoms was nearly alike in the two basins, but below 15 

 fathoms it was much colder at Ardlui than at Ross Mill, the 

 difference being 175 at 30 fathoms. 



lath 3*3 



Fig. 3. Curves of temperature, I5th October 1885. 



In the following table the mean temperature of the water 

 found between the surface and 20 fathoms, the surface and 

 30 fathoms, and between 20 and 30 fathoms, are given for Luss 

 and Ardlui as observed on 5th September and I5th October: 



TABLE V. Comparative Table of the Mean Temperature of 

 certain intervals in the waters of the Ardlui and the Luss 

 Basins on 5/// September and i$th October 1885. 



A comparison of these data brings out very l<.nlv the 

 rence in conditions obtaining in the two b;j>ins notwith- 

 standing their likeness in depth. At Ardlni the predominating 

 influence i> that of tin- important tributary, tin- Fallorh, which 

 influences the temperature of the lake water in its neighbourhood 

 most, while its tempo i lower than that of the lake. On 



loth October th- t-'inprutuiv oj | of the Douglas was 



J I 2 



