162 



Table containing Temperature Observations. 





Hour. 



Temperature. 



Wind. 



Weather. 





Bate. 



Air. 



;Surf. 



Water. 



Under 

 Surf. 



Under 

 Surf. 



Direction. 



Force. 



Surface Move- 

 ment of Water. 







Degs. 



Degs. 



Degs. 



Degs. 











1897. 







18 feet 













Sept. 3 



Noon. 





57-7 



57-6 





W.N.W. 



Light. 



Sky cloudy. 



Slight ripple. 











18 feet 











Dec. 16 





40 -o 



36-8 



36-5 





South. 



Moderate. 



Sky cloudy. 



Moderate ripple. 



1898. 









.50 feet 









March 3 





42-0 



36-0 



36-2 





North. 



Moderate. 



Sky cloudy. 



Moderate ripple. 











30 feet 



60 feel 







June 13 





5G-0 



57-7 



55-3 



54-0 



S.E. 



Light. 



Sky overcast. 



Slight ripple. 



The temperature in December and March is nearly uniform, not only 

 as regards the surface and bottom temperatures for the same month, but 

 also for both months. The surface and bottom temperatures are also 

 nearly uniform in September, while in June the surface temperature, 

 which is similar to that for September, is fully two degrees higher than 

 the temperature at five fathoms. This variation, it may be remarked, 

 agrees more or less with what has been observed in the examination of the 

 other lochs, and shows that it is not till August or September that the 

 summer heat is able to penetrate to any considerable depth. The highest 

 and lowest surface temperatures obtained show a difference of 21*7 degrees 

 Fahr. ; the under-surface difference is nearly the same, viz. — 21*4 

 degrees Fahr. 



Pelagic Entomostraca Captured in the Tow-Nets. 



Free-swimming Entomostraca, though very abundant in Loch Leven, 

 consisted mainly of the one species, Daphnia lacustris, G. O. Sars, 

 Leptodora liyalina was moderately common in the September gathering, 

 but it was not observed in any of the other three. Biajptomus gracilis 

 was frequent in the gathering collected in December, but was scarce in the 

 others, Bytliotrephes longi?nanus, though present in both the September 

 and June gatherings, was not observed in those collected in December and 

 March The names of the species and their distribution are shown in 

 the Table annexed. 



[Table. 



