56 



DR HUGH ROBERT MILL ON THE 



associated with this result, it may be either as a cause or an effect. The thermal 

 conditions would indicate that in the upper half of the water at Garroch Head the tidal 

 or wind currents gave rise mainly to horizontal movement in sheets, while in the lower 

 layers the movement, possibly on account of the slopes of the bottom, was more 

 complicated, and had a considerable vertical component. 



Observations in Inchmarnoch Water. — This station is the meeting-point of the deep 

 channels of the East and West Arran Basins, from which the greater depths run northward 

 through the Central Arran Basin. 



Table XVII. — Temperature Observations in Inchmarnoch Water. 



No. . . 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



Date . . 



19-6-86 



6-8-86 



25-9-86 



18-11-86 



11-2-87 



30-3-87 



9-5-87 



16-6-87 



7-7-87 



12-8-87 



22-9-87 



15-2-88 



No. of Pts. 



9 



16 



7 



9 



9 



9 



6 



15 



15 



18 



10 



13 



Temp. . . 



44-4 



48-2 



50-7 



50-9 



44-1 



43-7 



44-7 



47-2 



47-8 



49-9 



52-1 



44-6 



Slope . . 



+ 2-5 



+ 8-4 



+ 5-5 



-1-4 



-0-5 



o-o 

 (+2-1) 



+ 2-4 



+ 6-3 



+ 7-6 



+ 7-9 



+ 6-2 



-0-9 



H.D.* . . 



60 



5 







55 



83 



85 



55 



25 



35 











50 



h.t. . . . 



44-3 



45-6 





51-3 



44-1 



43-7 



44-4 



46-5 



46-3 







44-8 



* Assuming depth = 85 fathoms. 



The curves here call for no s£>ecial comment, being intermediate in character between 

 those of the Brodick and Skate Island stations, and in all their leading peculiarities the 

 description of the Skate Island curves is sufficient. 



Observations off Ardlarnont Point. — Observations at Ardlamont were taken in the 

 spur of the Central Arran Basin, which runs up into the Kyles of Bute, and they give a 

 good idea of the general temperature of the water entering that channel. 



Table XVIII. — Temperature Observations off Ardlamont Point. 



No. . 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



Date . . 



20.4.86 



19.6.86 



6.8.86 



25.9.86 



16.11.86 



29.12.86 



7.2.87 



11.5.87 



15.6.87 



12.8.87 



24.9.87 



3.12.87 



13.2.88 



23.3.88 



20.9.88 



No. of Pts. . 



7 



4 



7 



7 



6 



6 



4 



6 



10 



10 



4 



6 



6 



6 



6 



Temp. . 



41-9 



45-1 



50-0 



52-4 



50-8 



467 



43-4 



44-6 



48-5 



52-2 



54-5 



48-9 



44-0 



42-6 



53-2 



Slope . 



+2-3 



+ 3-2 



+ 6-1 



+ 1-9 



-2-5 



-1-5 



-0-8 



+3-6 



+9-8 



+ 3-6 



+ 1-9 



o-o 



-1-5 



-0-6 



+ 2-7 



As the depth at the place of observation is only about 35 fathoms, it is unnecessary 

 to note the thickness of the homothermic layer. The curves resemble the upper parts of 

 those for Inchmarnoch, and, as a rule, show the characteristic homothermic type at the 

 period of minimum, and clearly marked positive and negative slopes during the periods of 

 rapid heating and cooling. Fig. 17, Plate XXV., shows a curious instance in which a very 



