of the Fishery Board for Scotland. 



147 



Temperature and oilier Physical Observations. 



Temperature observations at both the upper and lower ends of Loch 

 Katrine were made on 9th and 10th September and 26th November 1897, 

 and on 16th March and 27th and 28th June 1898. The readings 

 obtained and the other records connected therewith are entered in the 

 annexed Table. 



Table showing Temperatures, &c. 











Temperature. 



Wind. 







Position. 



Date. 



Hour. 



Air. 



Water. 



Direction. 



Force. 



Weather. 



Surface Movement 

 of Water. 









Surf. 



5Fms. 



lOFms 









1897. 

 Sept. 9 



! p.m. 



Degs. 



Degs. 



57-4 



Degs. 

 54-S 



Degs. 

 53*3 



Variable. 



Light. 







Fine: mild. 



Smooth. 



Upper end, 

 oft' Stronach- 

 lacher. 



Nov. 26 

 1898. 

 Mar. 16 



2p.m. 

 10 a.m. 



46-7 



46 S 

 41 0 



47-0 

 413 



47 -0 

 417 



Westerly. 

 Westerly. 



Squally. 

 Squally. 



Showery. 

 Very sh'wry. 



Moderate, 

 ttough at times. 





June 27 



2 p.m. 



62-9 



58*0 



55-0 



48-5 



Easterly. 



Light, 



Dull; warm. 



Slight ripple. 



Lower end, 

 vicinity of 

 Ellen's Isle. 



1897. 

 Sept. 10 



Nov. 26 



1898. 

 Mar. 16 



10 a.m. 

 4 p.m. 

 3 p.m. 



• 



56 "0 

 46 8 

 416 



50 "0 

 47-0 

 42-0 



49-0 

 47-0 

 42T 



Variable. 

 Westerly. 

 Westerly. 



Light, 

 Squally. 

 Squally. 



Fine ; slight 



frost. 

 Showery. 



Very sh'wry. 



Smooth. 

 Moderate. 

 Somewhat rough. 





June 29 



. i . m. 



62-9 



*< 



55-0 



47-7 



N. Westerly. 



Light. 



Cloudy; fine. 



Slight ripple. 



The temperature observations as shown in this Table exhibit in some of 

 their aspects a close resemblance to those of Loch Lomond. If, for 

 example, the readings for the upper end of Loch Katrine, where the 

 water is moderately deep, and not so likely to be influenced by temporary 

 changes as shallow water, be compared with those for the upper end of 

 Loch Lomond it will be found that though the readings for Loch Katrine 

 are lower, the difference between the surface temperature and the 

 temperature at ten fathoms is, taking all the four readings, nearly the 

 same for both lochs. This is more clearly brought out by placing the two 

 series of differences side by side, thus : — 



Loch Lomond — Upper End. 



Loch Katrine — Upper End. 



Diff erence between the Temperature at 

 the surface and at ten fathoms on 



Difference between the Temperature at 

 the surface and at ten fathoms on 





Degrees. 





Degrees. 



August 26, 1897, 



5-1 



September 9, 1897, 



4-1 



November 25, 1897, - 



o-o 



November 26, 1897, 



0-2 



March 3, 1898, - 



0-4 



March 16, 1898, - 



0-6 



June 29, 1998, - 



10-8 



June 27, 1898, - 



107 



In the first of the above series, Loch Katrine shows a difference of one 

 degree less than Loch Lomond, but it will be observed that the date of 



