134 
TABLE 2. 
Mean Results of the Four Years. 
MONTH. 
In 
Vacuo. 
In 
Carbonic 
Acid Gas. 
in 
Hydrogen 
Gas. 
In Con- 
densed 
Air. 
Blk. Bulb 
freely 
Exposed. 
Maximum 
in 
Shade. 
o 
o 
o 
o 
o, 
o 
January 
45-8 
45-1 
45-1 
45-8 
43-8 
42-1 
February 
55-2 
53-9 
53-8 
55-2 
49-3 
45-1 
March 
69-0 
67-3 
66-6 
66-2 
59-1 
48-6 
April 
86-5 
83-5 
81-5 
82-3 
74-6 
59-3 
May 
93-8 
90-2 
88-8 
89-1 
79-2 
64-3 
June 
96-7 
96-2 
92-8 
93-8 
81-3 
66-1 
July 
102-6 
102-6 
98-1 
98-3 
87-0 
71-2 
August 
97-6 
95-0 
92-5 
93-9 
82-0 
68-4 
September 
85-2 
82-3 
79-6 
82-1 
74-0 
62-6 
October 
69-8 
67-7 
66-2 
68-6 
62-6 
57-5 
November 
51-2 
50-9 
50-5 
51-2 
48-4 
47-2 
December 
47-2 
46-9 
46-9 
47-7 
45-7 
461 
Annual Means. 
75-0 
73-4 
71-9 
72-9 
65-6 
56-6 
TABLE 3. 
Differences from the Readings of the Freely Exposed 
Black Bulb in the Sun. 
MONTH. 
In 
Vacuo. 
In 
Carbonic 
Acid Gas. 
In 
Hydrogen 
Gas. 
In Com- 
pressed 
Air. 
O 
o 
0 
o 
January 
2-0 
1-3 
1-3 
2-0 
February 
5-9 
4-6 
4-5 
5-9 
March 
9-9 
8-2 
7-5 
7-! 
April 
11-9 
8-9 
6-9 
7-7 
May 
14-6 
11-0 
9-6 
9-9 
June 
15-4 
14-9 
11-5 
12-5 
July 
15-6 
15-6 
11-1 
11-3 
August 
15-6 
13-0 
10-5 
11-9 
September 
11-2 
8-3 
5-6 
8-1 
October 
7-2 
5-1 
3-6 
6-0 
November 
2-8 
2-5 
2-1 
2-8 
December 
1*5 
1-2 
1-2 
2-0 
Means 
9-47 
7-90 
6-28 
7-26 
