CLYDE SEA AREA. 



101 



and 100 : 91 in Loch Fyne. Thus it appears that increasing isolation tends to increase 

 the period of gain of heat by retarding the date of maximum and reducing the rate of 

 gain of temperature. 



The rate of heating at various depths, and for the mass of water as a whole, is given 

 in Table XXXVL, and represented graphically in fig. 5, Plate IV. This shows that 

 the mean rate of heating per day is greater than that of cooling in the upper half of the 

 water, but less than the rate of cooling in the lower half. It also shows that the rate of 

 change of temperature is on the average 0° - 040 per day for the whole mass of water, 

 corresponding to 1° in 25 days. For the surface layer of 10 fathoms it is 0°'053, or 1° in 

 19 days (maximum, May to August, 1° in 10 days heating, and October to December, 

 1° in 12 days cooling) ; half way down it is 0°"033 per day, or 1° in 30 days ; and at the 

 bottom only o, 015 per day, or 1° in 66 clays. Plotting these figures — the average daily 

 change of temperature for the whole period — as absciss£e, with depths as ordinates, we see 

 in fig. 43, Plate XXX., how the restriction of thermal change goes on increasingly 

 until 40. 



Table XXXVL — Average Change of Temperature per diem in Loch Fyne. 









Change of 



Temperature in Degrees per Day. 





Dates. 



No. of 

 Days. 



















Mass. 



0-10 



10-20 



20-30 



30-40 



40-50 



50-60 



Over 60 







Fathoms. 



Fathoms. 



Fathoms. 



Fathoms. 



Fathoms. 



Fathoms. 



Fathoms. 



21.6.86 



62 



+ 0-038 



+ 0-060 



+ 0-025 



+ 0-024 



+ 0-029 



+ 0-037 



+ 0-040 



+ 0-042 



10.8.86 



50 



+ 0-070 



+ 0-099 



+ 0-094 



+ 0-061 



+ 0-020 



+ 0-002 



+ 0-001 



+ 0-002 



27.9.86 



48 



+ 0-040 



+ 0-021 



+ 0-066 



+ 0-059 



+ 0-034 



+ 0-014 



0000 



- 0-004 



16.11.86 



50 



-0-017 



-0-067 



- 0-030 



+ 0-011 



+ 0-070 



+ 0-038 



+ 0-020 



+ 0-010 



29.12.86 



43 



-0-060 



-0-079 



-0-067 



-0-061 



-0-062 



- 0-003 



+ 0-010 



+ 0-013 



4.2,87 



37 



-0-046 



-0-047 



-0-067 



- 0-059 



-0-029 



o-ooo 



+ 0-016 



+ 0-027 



29.3.87 



53 



-0-006 



+ 0-014 



- 0-005 



-0-013 



-0-030 



-0-035 



-0-030 



-0-023 



10.5.87 



42 



+ 0023 



+ 0-049 



+ 0-022 



+ 0-009 



- o-ooi 



- 0-003 



o-ooo 



-0-002 



15.6.87 



36 



+ 0-066 



+ 0-097 



+ 0-068 



+ 0-058 



+ 0-047 



+ 0-020 



+ 0-009 



+ 0-003 



7.7.87 



22 



+ 0-049 



+ 0-081 



+ 0-034 



+ 0-047 



+ 0-030 



+ 0-014 



+ 0-017 



+ 0-018 



15.8.87 



39 



+ 0-038 



+ 0-039 



+ 0-059 



+ 0039 



+ 0-013 



+ 0-014 



+ 0-006 



o-ooo 



23.9.87 



39 



+ 0-029 



-0-002 



+ 0-040 



+ 0-059 



+ 0-054 



+ 0-023 



+ 0011 



+ 0-006 



16.12.87 



84 



-0-050 



-0-086 



-0056 



-0043 



-0-014 



+ 0-013 



+ 0-018 



+ 0-019 



14.2.88 



60 



-0-031 



-0-016 



-0-031 



-0-042 



- 0-046 



- 0-043 



-0-036 



-0-028 



22.3.88 



36 



-0-057 



-0-054 



-0-069 



-0-060 



- 0-048 



-0-042 



- 0-037 



-0-036 



2.6.88 



73 



+ 0-028 



+ 0-043 



+ 0-031 



+ 0-018 



+ 0-004 



- 0-004 



-0-008 



-0-010 



Mean Heatiri| 



y 



+ 0-042 



+ 0-056 



+ 0-049 



+ 0-038 



+ 0-033 



+ 0-019 



+ 0-015 



+ 0-015 



No. of Ca 



ses . 



9 



9 



9 



10 



9 



9 



10 



9 



Mean Cooling 



3 



- 0-038 



- 0-050 



- 0-046 



-0-046 



- 0-033 



- 0-022 



-0-028 



-0-017 



No. of Ca 



ses . 



7 



7 



7 



6 



7 



6 



4 



6 



Mean Change 





0-040 



0-053 



0-048 



0-041 



0-033 



0-019 



0-016 



0-015 



