142 



DR HUGH ROBERT MILL ON THE 



Table LVI. gives concisely the mean temperatures of the various layers of depth into 

 which the sections were divided for convenience of calculation, and Table LVII. repre- 

 sents similarly the rate of change of temperature between consecutive observations. The 

 curves giving graphical expression to this table are not reproduced, as in the main they 

 merely repeat the general features of other curves of rate of change. In both the tables 

 only one of the temperature trips of December 1887 is included, in order to ensure some 

 approximation to the same order of magnitude in the intervals considered. 



Table LVI. — Mean Temperatures at Various Depths in Loch Strivan. 







Days 

 from Last. 





Mean Temperati 



ires. 





Section. 



Date. 



Mass 



Weighted 



Mean. 



0-10 fms. 



10-20 fms. 



20-30 fms. 



30-40 fms. 



I. 



14.4.86 





41-80 



42-23 



41-47 



41-40 



41-30 



II. 



17.6.86 



64 



44-90 



46-51 



43-81 



43-14 



43-07 



III. 



7.8.86 



51 



49-24 



50-83 



48-57 



47-34 



45-98 



IV. 



25.9.86 



49 



52 04 



53-45 



51-74 



50-07 



48-50 



V. 



13.11.86 



49 



50-46 



49-40 



51-20 



51-59 



51-55 



VI. 



23.12.86 



40 



46-57 



45-87 



46-93 



47-38 



47-97 



VII. 



7.2.87 



46 



43-45 



42-37 



44-73 



44-00 



44-00 



VIII. 



20.3.87 



41 



43-65 



43-45 



43-70 



43-89 



44-00 



IX. 



6.5.87 



47 



44-80 



45-33 



44-44 



44-26 



44-15 



X. 



14.6.87 



39 



48-19 



49-60 



47-59 



46-27 



46-05 



XL 



13.8.87 



60 



52-18 



55-01 



52-00 



49-66 



48-26 



XII. 



28.9.87 



46 



53-04 



53-83 



53-32 



51-69 



49-65 



XIII. 



2.12.87 



65 



49-25 



48-89 



49-38 



49-69 



50-10 



XVII. 



8.1.88 



37 



45-88 



45-64 



45-99 



46-19 



46-40 



XVIII. 



27.1.88 



19 



45-23 



45-18 



45-39 



45-56 



45-70 



XIX. 



11.2.88 



15 



44-67 



44-58 



44-74 



44-76 



44-75 



XX. 



27.3.88 



45 



42-84 



42-71 



43-04 



42-87 



42-85 



XXI. 



20.9.88 



177 



5207 



53-80 



51-39 



49-95 



48-55 



XXIII. 



20.10.88 



30 



50-34 



50-35 



51-13 



50-02 



49-90 



Table LVII. may be compared with Table LIIL, which gives the corresponding- 

 data for Loch Goil. In both lochs the rate of change of temperature in the surface 

 layers is the same, o, 0G2 per day, or equivalent to 1° in 16|days; but the average 

 change of the whole mass is 0° - 053 per day, or 1° in 19 days, contrasted with 23 days 

 for Loch Goil and 13^ for the Gareloch. From 30 to 40 fathoms the rate of change in 

 Loch Strivan was more rapid than in the other deep lochs, being equivalent to 1° in 20| 

 days as compared with 30 in the other cases. The peculiarity visible in Loch Goil 



