HALF- MONTHLY ABSTRACT. 
541 
D. 
HALF-MONTHLY ABSTRACT 
of the mean Force of the Wind, the mean Tcmjferatnre of the Air and Water, and 
the mean Height of the Barometer at the Level of the Sea. 
Mean 
Latitude. 
Month. 
Force of the 
Wind. 
Temperature of 
the Air. 
Temp, of Sur- 
face oftheWater. 
Height of Ba-| 
rometer. 
o 
49.4 N. 
1850. 
June. 
4 
+ 41.1 
+ 40.6 
29.95 
65.8 
(< 
3 
39.2 
36.9 
29.77 
73.1 
July- 
2 
36.2 
31.7 
29.76 
74.4 
3 
35.7 
30.1 
29.88 
75.4 
August. 
2 
35.8 
32.4 
29.99 
75.2 
(( 
4 
34.2 
31.6 
29.97 
1 74.8 
September. 
3 
27.1 
30.2 
30.18 
; 75.4 
u 
3 
16.5 
29.77 
1 74.9 
October. 
3 
6.9 
30.13 
1 74.8 
(( 
2 
— 2.8 
30.18 
1 74.7 
November. 
4 
— 6.7 
.. 
30.01 
! 74.6 
(< 
2 
— 8.6 
30,37 
74.3 
December. 
3 
— 16.1 
. _ 
30.13 
74.3 
<( 
2 
— 13.5 
29.98 
73.8 
1851. 
January. 
3 
— 16.6 
29.76 
73.3 
a 
3 
— 17.3 
29.92 
1 72.5 
February. 
2 
— 26.9 
. . 
29.82 
72.1 
« 
2 
—32.2 
30.38 
71.7 
Marcli. 
3 
—22.7 
29.98 
71.0 
4 
— 11.5 
30.14 
70.3 
April. 
2 
+ 6.0 
. . 
30.34 
69.8 
u 
2 
9.9 
30.47 
68.7 
May. 
3 
16.0 
30.36 
67.2 
(( 
3 
24.2 
30.11 
. 66.8 
June. 
3 
32.8 
32.0 
30.45 
70.2 
a 
3 
36.7 
32.7 
30.20 
: 73.3 
July. 
2 
38.3 
32.6 
30.22 
: 73.8 
u 
3 
36.4 
31.5 
30.22 
74.7 
August. 
2 
34.4 
. - 
30.31 
71.8 
u 
2 
37.3 
36.7 
30.08 
1 64.4 
September. 
3 
40.3 
40.5 
30.09 
