192 
MR. GLAISHER ON THE RADIATION OF HEAT 
Table XCVIII. 
General state of the 
1844. 
December. 
Reading 
of thermo- 
Excess ofthereadingof athermometerin ah', atthe height of 4 feet 
and protected from the effects of radiation, above that placed 
sky during the night 
previous to reading 
the instruments. 
Day and 
hour of 
reading. 
meter in air 
at the 
height of 
4 feet. 
On long 
grass. 
On short 
grass. 
On flax. 
In focus of 
metallic 
reflector. 
Cloudless. 
d h 
4 21 
26-1 
12*4 
o 
8-5 
14*9 
7*3 
5 21 
21-4 
13-5 
7*4 
17-4 
13*7 
6 21 
21-1 
12*2 
8-7 
14-1 
10-6 
7 21 
24-5 
9-6 
5-9 
10*0 
10-1 
11 21 
22-9 
10-0 
6*5 
10-4 
6*5 
19 21 
31-3 
8-0 
6-0 
6-8 
7-8 
Principally! 
cloudless. / 
20 21 
30-1 
7-2 
5*7 
7*1 
8-2 
Half-cloudv. 
None. 
Cloudy. 
1 21 
34-1 
1*9 
0*8 
2*1 
3*9 
2 21 
32-3 
30 
0*4 
2-3 
5*1 
3 21 
34-1 
2-2 
1*1 
1*6 
3*6 
8 21 
25*1 
2*3 
0-8 
-0*4 
3*9 
9 21 
27*8 
1*7 
0*3 
8*5 
3*3 
10 21 
27-7 
1*2 
— 0*2 
2*7 
3-0 
12 21 
23-2 
0-7 
— 0’8 
0*4 
2*9 
13 21 
24-4 
-0-3 
-0*9 
2*9 
22 
14 21 
28-1 
2-8 
1-4 
2*3 
2*7 
15 21 
35*4 
5*1 
3-6 
4*6 
4-8 
16 21 
37-1 
M 
0*4 
0*3 
2*9 
17 21 
38-1 
2-0 
1*1 
1*1 
3*1 
18 21 
40-3 
0-8 
0-3 
0*3 
2*3 
22 21 
29-1 
4-9 
2-9 
4*1 
5*9 
23 21 
29-5 
2-4 
0*7 
1*5 
4-0 
24 21 
31-3 
2*3 
1*8 
2*3 
2*3 
25 21 
31-1 
1*8 
0-8 
1*3 
3*4 
26 21 
27-6 
8*8 
3*4 
8*3 
0*4 
27 21 
29*8 
3-6 
0-9 
3*8 
2*6 
28 21 
40-5 
1-7 
1-0 
1*3 
3-2 
29 21 
37*5 
0-5 
— 1*1 
-0*5 
2*2 
30 21 
34-1 
5-8 
3*4 
2*5 
5'9 
31 21 
35-1 
4-9 
2*7 
2*9 
3-9 
