124 



DR HUGH ROBERT MILL ON THE 



The negative curves here, as in all other stations, are very much less pronounced than 

 the positive, the best defined negative paraboloid being No. 15. No. 8 shows a dis- 

 turbance on a negative parabolic curve somewhat more complex than No. 3 for a positive, 

 but of the same kind. In both the inflection occurs at 10 fathoms, suggesting the action 

 on the surface of outflowing water from Loch Goil. 



Curves 5 and G were taken on consecutive days, November 11th and 12th, 1886, and 

 the average temperature on the second day seemed to be about 0°'2 higher than on the first, 

 although the curves betoken surface cooling. This is partly accounted for by the second 

 observation being made in a spot 5 fathoms deeper than the first, these 5 fathoms being 

 occupied by warmer water. Both curves show a sub-surface maximum, followed by a 

 fall of temperature, and if more points on the curves had been ascertained they might 

 show a closer concordance. 



Out of the nineteen curves it is interesting to notice that no less than nine show 

 mixed slopes to a greater or less extent ; but from this station alone it does not appear 

 that change of slope within the curve is a normal feature of seasonal range. The position 

 of the Dog Rock Station is unique in the Area, as it is a deep depression at the junction 

 of three long narrow channels of different depth, salinity, and accessibility to sea 

 water. Consequently, it is peculiarly subject to variations in the slope of its temperature 

 curve similar to those at ( )tter I. Kilfinan. 



Observations at Loch Goil Mouth. — The observations made at the mouth of Loch 

 Goil were intended to be on the deepest part of the sill or bar which separates it from 

 the Dunoon Basin. The depth of observation usually varied from 9 to 12 fathoms, 

 although it is probable that a line, with 8 fathoms as its maximum depth, runs across the 

 mouth of the loch. The crest of the sill is narrow, and no leading marks were found to 

 enable its position to be fixed exactly while observing. The station lay on the line 

 between the curve of Corryn on the chart and Swine's Hole, where the channel 

 was \ of a mile wide. 



No salinity observations were made. 



Table XLVIIL — Temperature Observations at Loch Goil Mouth. 



No 



1 



■2 



3 



4 



5 



6 



7 



8 



9 



Date .... 



5.8.86 



8.2.87 



25.3.87 



7.5.87 



14.6.87 



7.8.87 



29.9.87 



30.11.87 



10.2.88 



Xo. of Points . 



4 



3 



3 



G 



6 



3 



2 



6 



3 



Temperature 



49-4 



43-5 



42-8 



46-5 



49-4 



55-9 



53-4 



47-3 



45-0 



Slope .... 



+ 33 



-2-8 



-0-8 



+ 2-4 



+ 2-5 



+ 2-8 



+ 0-3 



-23 



-0-2 



The curves were, as a rule, nearly straight lines, occasionally showing very well-marked 

 positive or negative slope. 



Observations off Carrick Castle. — Observations were made twice off Carrick Castle, 

 2 of a mile distant from the station at the mouth of the loch, in a depth of 25 fathoms. No 





