93 
PHYSICAL AND MATHEMATICAL SECTION. 
February 2nd, 1875. 
Alfeed Beothees, F.K.A.S., President of tlie Section, 
in the Chair. 
'' Results of Meteorological Observations taken at Lang- 
dale, Dimbula, Ceylon, in the year 1873,” by Edwaed 
Heelis, Esq. Communicated by J oseph Baxendell, 
F.R.A.S. 
TEMPEEATURE. 
Mean 
Temp, 
of the 
Month. 
Mean 
Daily 
Eange. 
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 
67*3 
9*2 
February 
65*90 
18*8 
70*2 
59*1 
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 
July 
63*90 
8-0 
64*9 
62*6 
2*3 
62*7 
61*4 
1*3 
August 
66*05 
11*1 
67*5 
64T 
3*4 
65*9 
643 
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 
2-5 
Means 
66*06 
14*9 
69*3 
62*5 
6*8 
65*1 
61*8 
3*3 
