CLYDE SEA AREA. 



125 



salinity observations were made. They were on March 25th and September 29th, 1887. 

 Six points on the curve were fixed on each occasion. On the former the mean temperature 

 was 43°'6, and the slope — l° - 6 ; on the latter the mean temperature was 51°'3, and the 

 slope +4°"5. Both curves are S-shaped, one positive and one negative. They betoken 

 a division of the water into three layers, a surface and a bottom one of nearly uniform 

 temperature, and an intermediate zone of rapid change of temperature. 



Observations at Stuckbeg. — At this point observations were made at the deepest part 

 of Loch Goil in mid-channel, about two-thirds of the way from the mouth to the head of 

 the loch. The depth is 47 fathoms, and the bed of the loch is exceptionally steep (see 

 Section 8b., Plate 7 in Part I.). The density of the water was as follows : — 



Mean (10 observations;, 



Maximum, 



Minimum, 



Surface. 



102293 

 102441 

 102036 



Bottom. 



1-02452 

 102471 

 102410 



Average percentage of pure sea-water at the surface 86*0, at the bottom 93*9, in 

 vertical section 92*6, and probable mean for normal year 9 2 2 per cent. This station 

 was a little Salter on the surface and a little less salt at the bottom than Dog Rock, the 

 average being practically the same. 



Table XLIX. — Temperature Observations off Stuckbeg. 



No. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



Date 



13.4.86 



17.6.86 



4.8.86 



5.8.86 



24.9.86 



12.11.86 



22.12.86 



8.2.87 



25.3.87 



7.5.87 



14.6.87 



No. of Points 



5 



10 



4 



10 



10 



14 



9 



9 



9 



9 



19 



Temperature . 



41-8 



434 



45-4 



45-6 



47-3 



48-4 



47-5 



45 5 



43-9 



44-5 



46-2 



Slope . 



+ 1-5 



+ 5-5 



+ 6-9 



+ 7-9 



+ 7-9 



+ 4-5 



-1-5 



-4-7 



-0-6 



+ 3-2 



+ 6-0 



No. 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 





Date 



7.8.87 



29.9.87 



15.10.87 



30.11.87 



9.2.88 



1.3.88 



28.3.88 



15.8.88 



3.9.88 



23.10.8J 



» ... 



No. of Points 



9 



8 



6 



12 



6 



6 



6 



6 



10 



6 





Temperature . 



49-8 



50-3 



49-9 



49-1 



46-0 



44-1 



433 



46-3 



47-0 



47-0 





Slope . 



+ 11-7 



+ 6-3 



+ 3-4 



-2-9 



-10 



+ 0-2 



+ 0-3 



+ 8-9 



+ 10-5 



+ 4-8 





It is unnecessary to analyse the temperature curves in detail. As in all other places 

 of observation, they approached a homothermic state at the annual minimum ; the slope 

 of the curves was positive during the months of heating, and negative during those of 

 cooling. Unlike the Gareloch, however, there is no tendency to assume a homothermic 

 state at the annual maximum, the transition from positive to negative slope being 



