160 
Proceedings of the Royal Society 
thermal conditions are complicated by the nature of the tidal basin* 
and by the peculiar relations borne to it by the Kiver Almond and 
Cramond Island, f 
Table III. 
Temperature of Air. 
Of Surface Water. 
Of Bottom Water. 
0 
O 
Max. 
Min. 
Mean. 
Max. 
Min. 
Mean. 
Max. 
Min. 
Mean. 
r 
at 
at 
at 
at 
at 
at 
9 a.m. 
9 p.m. 
9 a.m. 
9p.m. 
9 a.m. 
9 p.m. 
1885. 
Jan. 
49-0 
22-0 
37-0 
37-4 
39-5 
32 T 
37-4 
37-6 
40-0 
35-1 
37-8 
377 
Feh. 
58-0 
24-0 
41-0 
41-3 
42-0 
32-9 
38-8 
38-9 
41-7 
37-0 
39-2 
39-2 
Mar. 
50-8 
29-0 
40-9 
39-9 
43-5 
39-4 
40-3 
40-5 
46-0 
39-3 
40-4 
40-7 
Apr.+ 
1884. 
49-0 
30-0 
42-6 
41-2 
43-7 
38-9 
42-0 
41-9 
43-5 
38-9 
41-8 
421 
May§ 
69-5 
36-5 
50-6 
49-6 
53-5 
48-7 
50-0 
50-8 
52-0. 
49 T 
50 T 
50-4 
J une 
70-0 
41-4 
56-0 
54-4 
58 — 
50-0 
54*4 
551 
57-0 
50-7 
54-1 
54-2 
July 
74-0 
41-7 
57-3 
57‘0 
60-7 
52-7 
57-3 
57-5 
59-2 
55-0 
571 
56-9 
Aug. 
77-8 
431 
58-8 
57-4 
60-5 
56-2 
58-7 
58-4 
59-6 
55-0 
58 T 
58-2 
Sept. 
69 '3 
30-0 
55Y 
54*2 
56-0 
50 '5 
55-4 
55-2 
56-3 
52-0 
54-7 
54-9 
Oct. 
70-1 
32-0 
48-7 
48-2 
53-5 
41-3 
49-3 
49-5 
54 T 
43-7 
49-6 
49-9 
Nov. 
63-0 
23-0 
41-9 
41-6 
50-0 
37-5 
44-3 
44-4 
50-0 
39-3 
44-8 
44-7 
Dec. 
58-0 
25-0 
39 T 
39-0 
44-0 
32-0 
39-6 
39-8 
45-0 
37-0 
40-6 
40-6 
Year, 
77-8 
22 0 
47 T 
47-2 
60-7 
32-0 
47-3 
47-3 
59-6 
35-1 
47*3 
47-4 
The curves for these data show precisely the same state of 
matters as those for Trinity, North Berwick, and Dunbar, so far as 
the dkte of maximum and minimum is concerned. They show, too, 
that from May to September the surface water is warmer than the 
bottom water; while from October to April it is colder, and that the 
temperature of the air is On the whole lower than that of the water. 
The peculiar conditions of Granton Quarry make it impossible to 
accept its temperature indications as being applicable to the Firth 
outside ; they must be viewed merely as exaggerated examples of 
the effects of land on water. 
All the observations of surface temperature made in the Firth, 
several hundreds, have been classified for each month intb four 
regions (see Table IV.). Under 1 is given the mean of all observa- 
tions made at the stations marked on the chart (Plate III.); I., II., 
III., that is, from Alloa to the Hen and Chickens buoy; undef 2, 
those made at IV., Y., VI., from Blackness to Oxcar ; under 3, those 
* Proc. Roy. iSoc. Edin ;; xii. p. 927. t Ibid., xiii. p. 59. 
+ Up to 17th. § From 15th. 
