202 
MR. GLAISHER ON THE RADIATION OF HEAT, 
Table (Continued). 
General state of the sky 
during the night previous 
to reading the instru- 
ments. 
Year. 
Month. 
The mean excess in each month, according to the state of the sky with respect to the quantity of clouds, of 
the readings of a self-registering minimum thermometer placed in air at the height or 4 feet and protected 
On long grass 
exposed to |ths 
of the sky. 
On long grass. 
On short grass. 
On garden 
mould. 
In air one inch 
high. 
In air three 
inches high. 
Mean 
excess. 
Number 
of 
nights. 
Mean 
excess. 
Number 
of 
nights. 
Mean 
excess. 
Number 
of 
nights. 
Mean 
excess. 
Number 
of 
nights. 
Mean 
excess. 
Number 
of 
nights. 
Mean 
excess. 
Number 
of 
nights. 
Principally cloudy. 
1843. 
April. 
o 
o 
o 
o 
o 
o 
May. 
3-8 
6 
3-6 
6 
31 
6 
5-8 
6 
56 
6 
June. 
4-5 
9 
4-8 
9 
4-4 
9 
5*2 
9 
6-0 
9 
July. 
3-3 
6 
31 
6 
4-3 
5 
4-0 
6 
August. 
51 
2 
7-0 
2 
6-8 
2 
73 
2 
September. 
5-4 
1 
6-2 
i 
50 
3 
40 
3 
36 
3 
October. 
6-6 
3 
4-0 
3 
3-4 
3 
3-3 
2 
November. 
3-8 
2 
4-0 
2 
December. 
61 
7 
57 
7 
1844. 
January. 
6-9 
7 
6-2 
7 
February. 
5-6 
6 
3-4 
6 
March. 
6-6 
5 
51 
5 
April. 
9-5 
2 
8-9 
2 
May. 
5-2 
1 
4-7 
1 
June. 
8-7 
10 
7-9 
10 
July. 
7-5 
9 
7-2 
9 
August. 
4-9 
7 
4-4 
7 
September. 
6-6 
5 
5-2 
5 
October. 
5-6 
1 
5-8 
1 
November. 
60 
3 
3-8 
3 
December. 
0 
0 
Cloudy. 
1843. 
April. 
5-7 
2 
6-8 
2 
4-2 
2 
5-4 
2 
5-2 
2 
May. 
3-7 
12 
2-8 
12 
21 
12 
3-7 
12 
4-8 
12 
June. 
2-3 
5 
1-5 
5 
1-2 
5 
2-9 
5 
3-1 
5 
July. 
30 
5 
21 
5 
... 
2-9 
4 
2-3 
5 
August. 
1-5 
2 
1-2 
2 
1-5 
2 
1-7 
2 
September. 
30 
3 
2-9 
3 
31 
3 
3-1 
3 
October. 
3-7 
5 
37 
5 
4-2 
5 
11 
5 
November. 
21 
8 
1-7 
7 
1-9 
2 
December. 
30 
17 
2-8 
17 
1844. 
January. 
3-5 
8 
2-9. 
7 
February. 
3-9 
7 
3-6 
7 
March. 
3-2 
8 
2-8 
8 
April. 
2-6 
3 
2-6 
3 
May. 
5-5 
9 
5-4 
9 
June. 
1-7 
2 
1-6 
2 
July. 
3-2 
4 
2-2 
4 
August. 
4-9 
7 
4-4 
7 
September. 
3-1 
6 
2-9 
6 
October. 
5-3 
10 
4-2 
10 
November. 
3-2 
12 
2-5 
12 
December. 
2-7 
23 
11 
23 
