of Edinburgh, Session 1885 - 86 . 
423 
Table X . — Inversnaid Station, Collected Observations. 
Date. 
Sept. 5. 
Sept. 22. 
Oct. 15. 
Nov. 14. 
Depth. 
Temperature (Falir.). 
o 
o 
o 
o 
0 
56*0 
537 
487 
46-0 
5 
55-8 
537 
48-4 
10 
55-75 
53-65 
48-2 
45*8 
15 
49-8 
52-25 
481 
20 
45-6 
47-2 
47-8 
45‘8 
30 
43-2 
43-5 
45-3 
44-3 
35 
427 
42-6 
44*2 
40 
42-3 
45 
42-2 
42-25 
42-8 
50 
42*2 
65 
41 -8 
42 -b 
42-2 
42-15 
85 
417 
41-8 
42-0 
42-1 
100 
41-8 
41-8 
42-0 
42-1 
Table XI. gives the analysis of tlie results of the observations at 
Inversnaid, and is a form of heat account for the period — that is, 
it gives the receipt and expenditure of heat during the various 
intervals with reference to the points of intersection of the 
curves, where receipt and expenditure exactly balance each other 
over the period under consideration. Between the 1 8th August and 
the 5th September, an interval of 18 days, during which the tem- 
perature of the layer immediately at the surface had begun to fall, 
five times as much heat was conveyed downwards as was dissipated 
from the surface. Between the dates 5 th September and 22nd 
September the two quantities almost exactly balance one another. 
Between 22nd September and 15th October the amount transmitted 
downwards is only half what leaves the surface ; and between the 
15th October and 14th November the amount transmitted down- 
wards is quite insignificant — not more than 4 per cent, of what 
escapes to the air. The activity in the heat exchange has been 
greatest between 22nd September and 15th October when it has 
been dissipated at the surface at the rate of 3 *74 fathom- 
degrees, and conveyed downwards at the rate of 2 fathom-degrees 
per day. The crest of the heat wave passes from surface to bottom 
in about three months, the height of it decreasing very rapidly as 
the depth increases. 
