558 
PEOFESSOE EOSCOE ON THE CHEMICAL INTENSITY OF 
Table II. (continued.) 
j Date. 
Intensity. 
Date. 
Intensity. 
Date. 
Intensity. 
Date. 
Intensity. 
Date. 
Intensity. 
1 1865. 
| 1866. 
1866. 
1866. 
1866. 
| Dec. 1 1 
4-6 
Feb. 21 
21-3 
April 26. 
39-1 
July 7. 
91-6 
Dec. 14. 
19-5 
12 
8-3 
23 
25-4 
27. 
. 105-1 
12- 
229-0 
18. 
8-8 
13 
6-5 
24 
36-1 
30. 
27*3 
17- 
60-6 j 
19. 
18-5 
14 
12-0 
28 
28-9 
May 2. 
48-0 
18. 
119-4 
20. 
9-6 
16 
6-4 
| March 2 
1 43-8 
3. 
47-3 
20. 
119-5 
27. 
18-2 
18 
2-8 
3 
34-4 
4. 
80-9 
23- 
106-6 1 
31. 
14-6 
20 
9-2 
5 
31-0 
8. 
94-5 
25- 
67-7 
1867. 
21 
12-0 
7. 
31-0 
9. 
56-9 
27. 
35*8 
Jan. 16. 
13-9 
22 
5-6 
8. 
23*1 
14. 
60-7 
Aug. 5. 
71-6 
17. 
12-4 
28 
9-3 
9. 
24-1 
15. 
61-9 
13. 
81-0 
22. 
! 7-6 
1866. 
10. 
19-8 
j 17. 
76-1 
21. 
92-0 
23. 
4-8 
Jan. 1. 
19-7 
13. 
30-5 
18. 
75-6 
23. 
69-0 
24 
5-7 
2. 
15-2 
14. 
41-3 
22. 
63-8 
27. 
118-1 s 
25. 
1-6 
3. 
14-2 
15. 
37-2 
23. 
98-0 
31. 
143-7 ; 
29. 
12-4 
5. 
9-3 
16. 
37-4 
28. 
89*8 
Sept. 3. 
215-0 
Feb 1. 
8-6 
6. 
11*3 
19. 
9-3 
29. 
86-9 
10. 
88-5 1 
2. 
12-8 
9. 
22*1 
20. 
13-2 
30. 
60-7 
13. 
69-5 | 
5. 
19-0 
10. 
7-9 
23 
55-9 
31. 
49-8 
20. 
45-1 
6. 
12-4 
12 . 
17-2 
26. 
42-4 
June 1. 
66-1 
27- 
90-3 | 
7: 
21-9 
15. 
22’ 1 
27. 
18-2 
2. 
134-5 
28. 
93-8 
8. 
8-6 
20. 
20-1 
28. 
26*5 
4. 
93-8 
Oct. 1. 
65-9 
11. 
13-3 
23. 
22-6 
29. 
32-0 
5- 
52-1 
2. 
35-4 
12. 
10-5 
24. 
19-2 
April 3. 
24-9 
7- 
114-1 
3. 
80-1 i 
13. 
16-7 
25. 
13-2 
5. 
24-9 
9- 
86*5 i 
5. 
35-8 
14. 
18-6 
26. 
9-8 
6. 
28-6 
13. 
33-1 
16. 
23-9 
15. 
26-7 
27. 
8-8 
7. 
7-7 
14. 
94-6 
17. 
27-0 
19.1 
18-6 
29. 
23-6 
9. 
5-9 
15. 
48-0 
23. 
19-5 
20. 
28-0 
30. 
16-2 
10. 
38-5 
16. 
79*3 
24. 
34-5 
25. 
28-6 
Feb. 1. 
16-7 
11. 
25-4 
19. 
46-7 
Nov. 14. 
20-8 
March 4. 
13-3 
\ 5. 
20-4 
12. 
60-7 
20. 
106-4 
20. 
13-7 
5. 
20-0 
6. 
25-0 
13. 
52-2 
21. 
90-6 
21. 
19-5 
6. 
20-0 
8. 
37*5 
14. 
38*5 
22. 
111-6 
23. 
16-6 
8. 
6-2 
9- 
20-0 
17. 
67*4 
25. 
47-5 
24. 
16-6 i 
15. 
29-5 
10. 
24-0 
18. 
39-8 
26. 
100-2 
28. 
19-5 | 
20. 
36-2 
12 . 
19-7 
19. 
75-2 
27. 
99-5 
29. 
19-5 
21. 
23-8 
13. 
26*4 
20. 
38-9 
28. 
127-6 
30. 
15-6 | 
26. 
42-8 
15. 
20-0 
21. 
109-7 
29. 
104-0 1 
Dec. 1. 
9-0 | 
28. 
50-9 
17. 
13-7 | 
22. 
80-4 
July 3. 
138-1 
8. 
20-1 
19- 
29-5 
24. 
83-6 
4. 
125-1 ! 
10. 
14-1 
20. 
24-0 
25. 
73-7 
5. 
140-7 
13. 
7'8 
1 
The first result which presents itself from the daily observations is that the mean 
chemical intensity for hours equidistant from noon is found to be constant ; that is, for 
equal altitudes of the sun the chemical intensities are equal. Thus the mean of all the 
morning observations in 1805 (207 in number) was at 9 h 34 m a.m. = 0T53; that of the 
afternoon observations in the same year (197 in number) was at 2 h 27 m p.m. = 0T59; 
whilst in 1866 the mean of the morning observations (283 in number) was at 9 h 49 m a.m. 
= 0T19, and the afternoon observations (274 in number) at 2 h 29 m p.m. =0T16. The 
morning observations in 1867 (62 in number) at 9 h 50 m gave 0-044, the afternoon (58 in 
number) at 2 h 26 m gave 0-047. These give 
Chemical intensity. 
Mean of 552 morning observations in 1865-67 at 9 h 41 m a.m. =0-105 
Mean of 529 afternoon observations in 1865-67 at 2 h 27 m p.M. =0-107 
