CLYDE SEA AREA. 



39 



Table IX. summarises the observations made on the west and north-west parts of the 

 Plateau. 



Table IX. — Temperature Observations on the Great Plateau ( Western Side). 



No 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14t 



ist 



15a 



let 



17t 





15.4.86 



16.4.86 



16.4.86 



20.6.86 



12.8.86 



12.8-86 



22.9.86 



18.11.86 



18.11.86 



25.12.86 



10.2.87 



11.2.87 



31.3.87 



22.4.87 



27.4.87 



9.5.7 



10.5.87 



16.5.87 



No. of Points . 



7 



9 



7 



9 



14 



7 



7 



6 



12 



4 



6 



5 



3 



8 



6 



6 



9 



6 



Temperature . . 



42-6 



42-2 



42-8 



48-0 



53-0 



52-8 



54-2 



50-3 



50-0 



46-9 



43-8 



435 



43-5 



44-5 



44-3 



45-6 



45-4 



50-4 





+1-5 



+2-2 



+2-3 



+3-0 



+0-7 



+0-2 



-0-4 



+ 0-2 



-0-2 



-1-4 



-01 



-o-i 



+0-3 



+0-9 



+1-5 



+2-2 



+0.7 



4-1-4 



Placet .... 



S 



S-P 



R 



S-P 



S-P 



S 



S 



S-P 



D 



R 



D 



R 



D 



D 



D 



D 



D 



D-P 





24 



25 



20 



29 



24 



28 



23 



21 



20 



17 



25 



19 



20 



20 



29 



29 



24 



22 



No 



Date . . . . 

 No. of Points 

 Temperature . 

 Slope . . . . 

 Placet • • ■ 

 Depth . . . . 



18t 



19* 



20 



21 



22 



23 



24f 



25t 



26t 



27t 



28 



29 



30 



31 



32 



33 



34 



35f 



26.5.87 



18.6.87 



6.7.87 



6.7.87 



17.8.87 



21.9.87 



5.10.87 



6.10.87 



6.10.87 



1.12.87 



10.12.87 



22.12.87 



31.12.87 



31.12.87 



17.2.88 



6.3.88 



10.3.88 



1.10.S8 



6 



12 



12 



12 



12 



4 



6 



6 



7 



6 



6 



8 



3 



6 



3 



3 



3 



6 



50-2 



504 



52-0 



519 



56-0 



55-0 



54 1 



541 



541 



48-6 



47 9 



45-3 



46-3 



44 5 



43-7 



42-5 



427 



53-4 



+2-0 



+4-8 



+ 61 



+ 7-6 



+ 2-1 



-02 



+0-6 



+0-2 



+ 0-4 



-1-2 



-01 



-11 



-0-7 



-01 



o-o 



-0-5 



-01 



-1-5 



D-P 



S-P 



S-P 



D 



S-P 



R 



D-P 



D 



D-P 



S-P 



D-P 



D 



S 



R 



D-P 



S 



R-S 



P-S 



24 



25 



27 



23 



23 



22 



26 



25 



30 



26 



22 



21 



20 



21 



19 



20 



20 



34 



D, Davaar. P, Pladda. S, Sanda. R, Rhuad Point. 

 * Mean of thirteen accordant soundings. t Observations made by F. C. " Vigilant." 



t The sign - in this line signifies that the point of observation was between the two stations denoted. 



Additional observations were made too near shore to be of equal value with the rest 

 ob November 23rd, 1887, in 14 fathoms, when the mean vertical temperature was 

 49°'6, and on February 1st, 1888, when the mean was 44°*1. 



The mean rate of change of temperature as deduced from observations on the western side 

 of the Plateau was so unsatisfactory that it is unnecessary to enter into the details. It is 

 sufficient to point out that differences of several degrees in mean temperature occurred in 

 a distance of 4 or 5 miles, according to the position of the observing stations on the sea- 

 ward or inner slope of the Plateau, and that such observations must obviously be much 

 affected by local tidal conditions. This state of matters makes it impossible to estimate 

 mean rates of change of temperature over any length of time, although for short periods 

 when the temperature of the whole Area is fairly uniform a comparison might be safely 

 attempted. 



The Plateau is so obviously a transitional zone between the oceanic and landward 

 waters that it must be viewed in connection with both, and it can scarcely be treated as 

 a separate natural region. 



General Form of Temperature Curve. — The fifty -two temperature curves for the 

 Plateau, summarised in Tables VII. and IX., show an average slope, i.e., range of tempera- 

 ture between the mean for the surface and bottom 5 fathoms, disregarding the sign, of 1°2. 

 The curves resemble those of the Channel by having less than 0°'3 difference between 

 top and bottom layers in February, March, September, and October, and occasionally in 



