[ 46i ] 
don 51°. It is probable, that the mean heat of good 
fprings in any country is very nearly the mean heat of 
the country A faithful account of the heat of fprings 
in different latitudes, and of water taken from the fame 
depth of the fea in different latitudes is yet wanted. 
I am. See. 
(a) We lliall have an eafy method of finding the mean heat of any place^ 
if it be always nearly equal to that of its fprings. This matter might be afeer- 
talned by a proper number of obfervations ; and it is therefore very defireable, 
to have an account taken of the heat of the fprings, wherever a regifter is kept 
of the heat of the air. w. heberden. 
Mean Heat in pall mall, London. 
17 
72. 
1773- 
1774. 
Mean heat of 
Three Years. 
8 A.M. 
2 P. M. 
8 A.M. 
2 P.M. 
00 
2P. M. 
8 A.M. 
2 P.M. 
January 
36 
38 
42 
44 
34 
39 
37-3 
40.3 
February 
38 
42 
36 
41 
38 
44 
37-3 
42-3 
March 
41 
47 
40 
S' 
41 
52 
40.7 
50 
April 
44 
SI 
45 
55 
47 
55 
45-3 
53-7 
May 
49 
60 
SO 
60 
51 
60 
50 
60 
June 
64 
73 
58 
67 
59 
67 
60.3 
69 
61 
72 
60 
68 
61 
69 
60.7 
69.7 
Auguft 
60 
70 
62 
72 
62 
70 
61.3 
70.7 
September 
56 
65 
56 
63 
55 
63 
55-7 
63-7 
Oiflober 
56 
61 
SI 
59 
48 
58 
S'-7 
59-3 
November 
45 
55 
40 
47 
40 
44 
41.7 
48.7 
December 
41 
44 
41 
45 
39 
43 
40.3 
44 
Mean I 
49-2 1 
56.5 
48.4 
56 
47-9 
55-3 1 
48.5 
56 
Mean heat of three years morning and afternoon was 
52.2. 
Mean 
