CLYDE SEA AREA. 



123 



Mean (11 observations), 



Maximum, 



Minimum, 



Surface. 



1-02280 

 102416 

 1-01867 



Bottom. 



102463 

 1-02504 

 1-02420 



The average percentage of pure salt water at the surface was 84 "1, at the bottom 

 94*5, iu the whole vertical section 92*8 ; and the assumed percentage for a normal year 

 in the vertical section is 92*5, practically the same as that in Loch Goil, as a whole, and 

 1 per cent, less than in the Dunoon Basin as a whole. 



Table XLVII. — Temperature Observations off Dog Bock. 



No. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



Date 



13.4.86 



17.6.86 



5.8.86 



24.9.86 



11.11.86 



12.11.86 



22.12.86 



8.2.87 



25.3.87 



7.5.87 



No. of Points . 



5 



10 



13 



16 



7 



6 



8 



9 



6 



9 



Temp. . 



41-8 



43-9 



47-3 



51-9 



51-2 



51-4 



47-4 



44 4 



43-5 



44-4 



Slope 



+1-9 



+ 5-1 



+ 3-5 



+0-2 



-1-7 



-2-2 



-2-1 



-2-8 



-0-7 



+3-7 



No. 



11 



12 



13 



14 



15 



16 



» 



18 



19 





Date 



14.6.87 



7.8.87 



29.9.87 



15.10.87 



30.11.87 



9.2.88 



1.3.88 



28.3.88 



3.9.88 





No. of Points . 



13 



9 



6 



6 



9 



6 



,! 



6 



9 





Temp. 



46-9 



51-7 



53-3 



52-6 



49-0 



44-9 



441 



42-7 



50-3 





Slope . 



+ 6-8 



+ S-3 



+0-4 



-0-3 



-2-6 



-0-8 



-M 



+ 0-3 



+6-9 





The highest mean vertical temperature observed was 53°'3 in September 1887, the 

 lowest was 41 0, 8 in April 1886, a total range of 11 0, 5. The form of the individual 

 curves was often interesting. Nos. 4, 13, 14, and 18 were, in view of their "slope," 

 practically honiothermic. This was really the case only for Nos. 1 3 and 1 8 in September 

 1887 and March 1888, the former the yearly maximum, the latter the yearly minimum. 

 In the case of No. 14, and very conspicuously in No. 4, the vertical curve was made up 

 of sections of alternately positive and negative slope giving a contorted curve about a 

 vertical axis, showing the existence of alternate layers of unmixed warmer and colder 

 water (see L in fig. 3, Plate XXIL). Curve 4, in a depth of 50 fathoms, was very fully 

 delineated, sixteen points being determined on it. It showed that the layers alternated, 

 in increasing thickness, warm, cool, warm, cool, and warm again. The surface tempera- 

 ture was 52°*9 (the maximum), the bottom 52°'l ; the minimum, at 29 fathoms, was 

 51°-1, and the average of the whole depth 51° -9. 



Nos. 1, 2, and 10 were typical positive paraboloid curves, showing a great range in the 

 surface layers and practical homothermicity below. No. 3 is a positive curve showing- 

 rapid heating from the surface to 10 fathoms, and beneath that a negative curve of 

 nearly uniform gradient to the bottom. 



