48 



DR HUGH ROBERT MILL ON THE 



The curves are roughly similar to those of Carradale, so much so that in February 1888 

 both stations showed the upper 30 fathoms of water in a homothermic condition. 

 Frequently in summer the mean temperature at Largybeg, and also the positive slope, 

 w r ere somewhat greater than at Carradale. The curves, too, showed more variety. In 

 August the whole mass of water became heterothermic, with a strong positive slope. 

 On both occasions (Nos. 2 and 6) these curves approximated more to the North 

 Atlantic type than any others observed in the Sea Area. They are reproduced as a and 

 b in fig. 11, Plate XXIV. An approach to a sickle-shaped curve, c, is also shown. The 

 peculiarities of these curves may be due to the great surface of shallow water to the 

 eastward, which in summer acquires a high temperature. 



Observations off Brodick. — The position in which observations were made at this 

 station should have been the greatest depth of the West Arran Basin, lying about 5% 

 miles east of the coast of Arran, with Brodick Bay open ; but on account of the frequent 

 roughness of the sea and the absence of convenient landmarks, the exact position was 

 not always found. 



Table XIII. — Temperature Observations off Brodick. 



No. . . 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14f 



15 



16 



17 



18 



19f 



Date . . 



13.6.79 



15.4.86 



17.4.86 



20.6.86 



23.9.86 



19.11.86 



26.12.86 



9.2.87 



3.4.87 



5.5.87 



17.6.87 



12.8.87 



20.9.87 



27.10.87 



10.12.87 



17.2.88 



30.3.88 



19.8.88 



19.12.88 



No.ofPts. 



10 



6 



8 



5 



4 



9 



9 



6 



10 



13 



18 



15 



9 



13 



12 



12 



9 



6 



8 



Temp. . 



43-9 



41-6 



41-5 



45-4 



52-4 



50-8 



47-4 



43-7 



43 6 



44-6 



47-7 



50-1 



52-0 



52-5 



47-6 



44-4 



42-0 



50-6 



46-8 



Slope . 



+ 9-4 



+ 1-2 



+ 1-4 



+ 6-7 



+ 4-5 



-1:3 



-2-2 



-0-8 



+0-6 



+3-3 



+ 6-4 



+ 8-9 



+ 5-6 



-0-9 



-2-1 



-1-9 



-0-5 



+7-5 



-1-4 



H.D. . 



55 



70 



65 



45 







50 



35 



45 



30 



50 



50 



10 







40 



45* 



40 



30 



10 



35 



h.t. . . 



427 



41-5 



41-4 



44-1 





51-2 



48-0 



44-2 



42-8 



44-3 



46-3 



47-1 





52-9 



47-6 



44-8 



42-4 1 47-1 



47-4 



Assume depth as 75 fathoms. 

 Below the homothermic layer comes 15 fathoms of rapid slope. 



+ Observations by F.C. "Vigilant. 



The curves on the whole closely resembled those observed at the same date at the 

 Largybeg station. As in the former instance, there were several curves closely 

 approaching the oceanic type, and in particular two remarkable specimens of inverted 

 positive curves were presented in September 1886 and September 1887, Nos. 5 and 13 

 in Table XIII. These were the only cases in which there was no homothermic water 

 present, but the variation in the depth of the homothermic water at other seasons was 

 somewhat irregular. 



Cross- sections in East Arran Basin. — In August 1886 and September 1887 a 

 number of observations were made in order to test the influence of the shallow shore 

 waters on the general temperature of the whole about the time of the annual 

 maximum. 



On August 27th, 1886, observations were made at several points between Whiting Bay, 

 in Arran, and Ayr, a distance of 17t> miles. The surface temperature on the Arran coast 

 was 55°"3, in mid-channel 55 9 '4, and on the Ayrshire coast 57°'5. On a section drawn to 



