HALF-MONTHLY ABSTRACT. 541 
D. 
HALF-MONTHLY ABSTRACT 
of the mean Force of the Wind, the mean Temperature of the Air and Water, and 
the mean Height of the Barometer at the Level of the Sea. 
Mean 
ivioniii. 
Force of the 
Temperature of j Temp, of Sur- 
Height of Ba- 
Latitude, 
Wind. 
tlie Air. 
face of the Water. 
rometer. 
o 
1850. 
49.4 N. 
June. 
4 
+ 41.1 
-j-40.6 
29,95 
65.8 
46 
3 
39.2 
36.9 
29.77 
73.1 
July. 
2 
36.2 
31.7 
29.76 
74.4 
a 
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 
74.8 
September. 
3 
27.1 
30.2 
30.18 
75.4 
u 
3 
16.5 
--■ 
29.77 
74.9 
October. 
3 
fi Q 
D.y 
30.13 
74.8 
a 
2 
— 2.8 
OU. i o 
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 
a 
1851. 
2 
— 13.5 
29.98 
73.8 
January. 
3 
— 16.6 
29.76 
73.3 
a 
3 
— 17.3 
29,92 
72.5 
February. 
2 
— 26.9 
29.82 
72.1 
a 
2 
— 32.2 
30.38 
71.7 
March. 
3 
—22.7 
29.98 
71.0 
4 
— 11.5 
30.14 
70.3 
April. 
2 
+ 6.0 
30.34 
69.8 
a 
2 
9.9 
30.47 
68.7 
May. 
3 
16.0 
30.36 
67.3 
3 
24.2 
30.11 
66.8 
June. 
3 
32.8 
32.0 
30.45 
70.2 
3 
36.7 
32.7 
30.20 
73.8 
July. 
2 
38.3 
32.6 
30.22 
73.8 
3 
36.4 
31,5 
30.22 
74.7 
August. 
2 
34.4 
30.31 
71.8 
2 
37.3 
36,7 
30.08 
64.4 
September. 
3 
40.3 
40.5 
30.09 
