CLYDE SEA AEEA. 



57 



abrupt inflection in the Inchmamoch curve is repeated at the same position at the very 

 bottom of the Ardlamont curve. This shows a remarkably horizontal arrangement of the 

 isothermal sheets, as the stations are five miles apart. On this occasion there was no trace 

 of extra heating in the shallow water ; in fact, the Ardlamont temperature was lower than 

 that in the centre of the open water. The upjjer 28 fathoms of comparatively warm 

 water was resting very abruptly and over a large area on the colder mass below. 



Observations off Skate Island. — The exact position is given by the bearing, centre of 

 Skate Island, E. ^ S. 7 cables; and its depth 107 fathoms (Sections 16 and 19, C D, 

 Plate 9 in Part I.) is the greatest of any part of the Arran Basin. It lies in the centre 

 of the long depression which runs up the East Arran Basin, and is the deepest point 

 in the whole Clyde Sea Area. 



The average density of water at 60° F. was as follows : — 



Mean 



Maximum 



Minimum 



Average Percentage of pure 1 

 sea-water J 



Surface, 13 observations. 



. . 1-02446 

 . . 1-02497 

 . . 1-02373 



. . 94-0 



Bottom, 13 observations. 



1-02508 

 1-02530 

 1-02471 



96-5 



In the vertical section, during the period of observation, the proportion of pure sea- 

 water was 96 "0 per cent., or in a normal year 95 "7 per cent. 



In estimating the homothermic depth, given below, the total depth is assumed as 

 105 fathoms. 



Table XIX. — Temperature Observations off Skate Island. 



No. . . 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



1 



Date . . 



28.8.78 



21.9.78 



25.6.7' 



)29.7.8i 



> 28.8.8. 



) 27.3.8* 



519.4.86 



21.6.86 



10.8.86 



17.9.86 



26.9.86 



16.11.86 



29.12.86 



7.2.S7 



28.3.87 



10.5.87 



15.6.87 



16.6.87 



No.oi'Pts. 



13 



11 



14 



4 



7 



9 



10 



7 



19 



7 



19 



15 



12 



12 



12 



15 



15 



15 



Temp. . 



51 '0 



53-2 



43-7 



50(?) 



49-7 



41-3 



41-6 



44-3 



47-3 



49-8 



49-8 



51-2 



47-2 



44-5 



43-8 



44-3 



46-6 



46-8 



Slope 



+ 9-4 





+ 8-2 





+ 6-6 



0.0 



+ 2-5 



+3.3 



+ 6-9 



+ 7-1 



+ 6-1 



-1-8 



-0-8 



-0-4 



/-10\ 



-o-i 



+ 2-0 



+ 4-4 



+ 5-6 



H.D. . 









75 





35 



105 



85 



85 



55 



20 







85 



85 



100 



105 



95 



45 



S5 



h.t. . . 







42-6 





47-6 



41-3 



41-3 



44-0 



45-2 



47-4 





51-4 



47-4 



44-5 



43-8 



44-2 



46-1 



44-1 



No. . . 



19 



20 



21 



22 



23 



24 



25 | 26 



27 



28 



29 30 



31 



32 



33 



34 



35 



36 



Date . . 



7.7.87 



8.7.87 



31.7.871 



4.8.871 



6.8.871 



2-9-87 5 



2.9.8718.12.87 



2.1.88 



7.1.88 



15-2-8828.2.88 



22.3.88 



6.4.88 



14.4.88 



16.5.88 



5.6.88 



19.10.88 



No.oi'Pts. 



14 



11 



17 



12 



n 



6 



12 



18 



12 



9 



15 



9 



15 



9 



6 



12 



9 



15 



Temp. . 



47-1 



47-5 



49-0 



49 -2 



49-7 



1 



51-2 



47-7 



46-5 



46-3 



44-6 



44-2 



42-9 



42-6 



42-5 



43-4 



44-1 



49-5 



Slope. . 



+ 6-6 



+ 7-0 



+ 8-8 



+ 6-3 



+7-2 





+4-9 



-1-6 



-1-2 



-0-9 



-1-1 



-2-9 



-0-3 



+0-1 



+ 1-5 



+2-3 



+ 4-2 



+2-2 



H.D. . 



55 



50 



40 



35 









35 



55 



60 



40 



75 



60 



95 



105 



75 



6 



55 



30 



h.t. . . 



46-2 



46-2 



46-5 



47-2 







49-2 



48-1 



46-9 



46-7 



44-8 



44-9 



43-0 



42-6 



42-3 



43-0 



43-0 



48-6 



VOL. XXXVIII. PART I. (NO. 1). 



H 



