568 
PROFESSOR ROSCOE ON THE CHEMICAL INTENSITY OF 
Chemical Intensity of Total Daylight at Para, April 24th, 1866. 
Solar 
time. 
Chemical 
Condition of solar 
Clouds. 
Temperature ° C. 
intensity. 
disk. 
Dry. 
Wet. 
h 
6 
m 
55 
0-151 
Sunshiningthrough 
24-4 
24-2 
millims. 
763-5 
7 
30 
0-213 
mist. 
Clouded. 
9-10 
25-6 
24-9 
8 
0 
0-359 
Id. 
8 
26-6 
25 -6 
9 
31. 
0-633 
Thin haze. 
2 
29-4 
26-4 
10 
2 
0-684 
Unclouded. 
2 
30-0 
26-4 
767-0 
10 
30 
0-719 
Id. 
2 
30-6 
26-1 
11 
3 
1 0-951 
Id. 
3 
32-3 
27-8 
12 
0 
1-019 
Id. 
4 
31-7 
25-9 
1 
0 
0-942 
Id. 
31-7 
25-3 
2 
0 
0-754 
Id. 
4 
32-2 
26-1 
764-5 
3 
0 
0-492 
Id. 
2 
32-2 
25-1 
3 
51 
0-389 
Id. 
3 
30-1 
26-6 
762-5 
4 
29 
0-306 
Id. 
3-4 
29-0 
26-2 
Chemical Intensity of Total Daylight at Para, April 25th, 1866. 
Solar time. 
Chemical 
Condition of solar 
Clouds. 
Temperature ° C. 
Barometer. 
intensity. 
disk. 
Dry. 
Wet. 
h m 
millims. 
6 48 
0-116 
Unclouded. 
0-5 
24-2 
23-6 
765-5 
7 31 
0-312 
Id. 
0-5 
25-9 
25-0 
9 41 
0-490 
Clouded over. 
29-4 
25-4 
766-8 
10 3 
0-762 
Unclouded. 
3-4 
31-3 
27-0 
10 29 
0-944 
Id. 
5 
31-9 
26-5 
' : 
10 53 
0-529 
Clouded over. 
4-5 
31-1 
26-2 
i 
1 
10 55 
0-959 
Unclouded. 
4-5 
31-1 
26-2 
11 29 
0*475 
Clouded over. 
6-7 
32-7 
27-4 
11 30 
0-976 
Unclouded* 
6-7 
32-7 
27-4 
11 45 
12 0 
0- 479 
1- 011 
Clouded over. 
Unclouded. 
5 
5-6 
32-2 
26-6 
766-0 1 
12 16 
12 47 
0-977 
0-882 
Id. 
5 
32-0 
31-3 
26-1 
26-9 
26-6 
1 
1 0 
0-335 
Overcast; gloomy. 
29-7 
1 23 
0-365 
Id. ; id. 
29'7 
26-7 
1 47 
0-774 
Unclouded. 
5 
30-8 
27-5 
2 39 
2 45 
0-236 
Rain. 
Clouded over. 
8 
28-3 
26-1 
3 6 
3 45 
0-677 
Rain. 
Unclouded. 
7-8 
29-7 
27*2 
763-0 
3 49 
4 5 
0-210 
Rain. 
Clouded. 
9 
28-3 
26-1 
