93 
PHYSICAL AND MATHEMATICAL SECTION. 
February 2nd; 1875. 
Alfred Brothers, F.RA.S., President of the Section, 
in the Chair. 
“ Results of Meteorological Observations taken at Lang- 
dale, Dimbula, Ceylon, in the year 1873,” by Edward 
Heelis, Esq. Communicated by J oseph Baxendell, 
F.R.A.S. 
TEMPERATURE. . 
Mean 
Temp, 
of the 
Month. 
Mean 
Daily 
Range. 
10.30 a.m. 
6 p.m. 
Air. 
Evap. 
Diff. 
Air. 
Evap. 
Diff. 
January 
64-35 
18-1 
67-6 
55-9 
11-7 
66-5 
57-3 
9-2 
February 
65-90 
18-8 
70-2 
59T 
11-1 
66-5 
59-8 
6-7 
March 
67-60 
23-0 
74-5 
60-6 
13-9 
66-2 
59-6 
6-6 
April 
68-40 
20-0 
74-4 
65-1 
9-3 
66-6 
63-8 
2-8 
May 
67-65 
17-5 
73-3 
66-4 
6-9 
66-2 
64-4 
1-8 
June 
64-70 
6-6 
65-3 
63-9 
1-4 
63-2 
62-1 
1-1 
Jnly 
63-90 
8-0 
64-9 
62-6 
2-3 
62-7 
61-4 
1-3 
August 
66-05 
11-1 
67-5 
64-1 
3-4 
65-9 
64-3 
1-6 
September ... 
65-85 
14-3 
67-2 
62-3 
4-9 
64-1 
61-6 
2-5 
October 
65-00 
11-0 
65^9 
64-4 
1-5 
63-3 
61-8 
1-5 
November.... 
66-90 
15-2 
70-4 
63-6 
6-8 
64-8 
62-5 
23 
December 
66-50 
15-2 
70-1 
61-9 
8-2 
65-0 
62-5 
25 
Means 
66-06 
14-9 
69-3 
62-5 
6-8 
65-1 
61-8 
3-3 
