134 



DR HUGH ROBERT MILL ON THE 



The period of warming in 1888, up to probably 51°*2, was about 180 days, at the rate 

 of o, 043 per day. The average time of heating for the three years was 179 days in 

 Loch Groil, and the average time of cooling for the two seasons 177. In 1888 it 

 happened curiously enough that the period of heating was the mean of the two earlier 

 years, so that for the two years comparable for the whole Area the ratio of time of 

 heating to time of cooling was 179: 177 or 100 : 99. Taking 100 as representing the 

 duration of heating, the duration of cooling in the different divisions was : — 



Gareloeh. Channel. Arran Basin. Loch Goil. Loch Fyne. 



130 115 100 99 91 



J udged in this way, the two divisions, where the surface-temperature is always close to 

 the average temperature of the water, would seem to heat up more quickly than they 



Table LIII. — Average Change of Temperature per diem in Loch Goil. 



J )ate. 



No. of 

 Days. 



Mass of Water. 



0-10 Fathoms. 



10-20 Fathoms. 



20-30 Fathoms. 



30-40 Fathoms. 



17.6.86 



65 



+ 0-040 



+ 0-062 



+ 0-032 



+ 0-013 



+ 0-008 



3.8.86 



49 



+ 0-054 



+ 0-072 



+ 0-046 



+ 0-036 



+ 0-026 



24.9.86 



50 



+ 0-036 



+ 0-038 



+ 0-049 



+ 0-018 



+ 0-021 



12.11.86 



49 



+ 0-008 



- 0-023 



+ 0-029 



+ 0-037 



+ 0-037 



22.12.86 



40 



-0-057 



-0-104 



- 0-062 



+ 0-025 



+ 0-045 



8.2.87 



48 



-0 040 



-0-057 



-0-035 



- 0-020 



-0012 



25.3.87 



45 



- 0-029 



o-ooo 



-0036 



-0-056 



-0-077 



7.5.87 



43 



+ 0-027 



+ 0-060 



+ o-ooo 



-0 000 



-0000 



14.6.87 



38 



+ 0-063 



+ 0-095 



+ 0-047 



+ 0028 



+ 0-028 



7.8.87 



54 



+ 0-093 



+ 0-118 



+ 0-102 



+ 0-042 



+ 0-017 



29.9.87 



53 



-0-011 



-0-047 



o-ooo 



+ 0-036 



+ 0-041 



30.1 1.87 



62 



-0-051 



-o-ioo 



- 0-034 



+ 0-010 



+ 0-024 



9.2.88 



74 



-0-040 



-0-028 



- 0-048 



-0-053 



-0-048 



1.3.88 



21 



-0-076 



-0-055 



- 0088 



-0-098 



-0-101 



28.3.88 



27 



- 0-025 



-0-003 



- 0-002 



-0-002 



- 0002 



Mean Heating . 





+ 0-046 



+ 0-074 



+ 0-051 



+ 028 



+ 0-027 



No. of Cases 





7 



6 



6 



9 



9 



Mean Cooling . 





-0041 



-0052 



- 0-043 



- 0046 



- 0-048 



No. of Cases 





8 



8 



7 



5 



5 



Mean Change . . . 



0-043 



0-061 



0-047 



0-034 



0-034 



