160 
PROCEEDINGS OF 
[Feb. 
The following is a general summary of the results: 
Maximum.. 
Minimun... 
Mean........ 
Daily var’n. 
The Barometer. 
Maximum.. 
Minimum.. 
Mean. 
Daily var’n. 
Temperature. 
Maximum.. 
Minimum.. 
Mean. 
Daily var’n. 
The maxima of the declination and temperature, for each of the months, except 
September, occur at the same hour, viz : 20hrs., Gottingen, (2hrs. 13" P. M., Wash, 
ington,) but in that month, while the maximum declination was observed two hours 
earlier, that of the temperature was two hours later. Lieut. Gilliss stated, that this 
result did not arise from a single observation, which masked the regular period, 
but was actually the case on more than half the days of the month. 
The minimum declination, except for December, falls at 14hrs., Gottingen; in 
December, at 4hrs. That of the temperature, except for December, at lOhrs., and 
in that month two hours earlier. 
The maximum pressure of the barometer, except in August, is at 16hrs., and in 
that month, at 14hrs. The minima occur at different hours in all the months. 
Mr. Townsend, from the committee appointed to examine Mr. 
Castelnau’s collections, reported, that they found the collection 
enclosed in four large wooden boxes, marked 2, 4, 5, 6, respec- 
July. 
August. 
September. 
October. 
November. 
December, 
86°.5 
84°. 5 
74°.0 
67°.6 
52°.3 
40°.0 
71°.0 
72°.0 
57°.8 
49°.7 
40°.5 
29°.0 
78°.7 
78° .2 
65° .9 
58°.6 
46°.4 
34°.5 
15°.5 
12°.5 
16°.2 
17°.9 
11°.8 
11°.0 
July. 
August. 
September. 
October. 
November. 
December. 
30.118 
30.074 
30.139 
30.098 
30.009 
30.075 
30.056 
30.028 
30.030 
30.041 
29.947 
30.003 
30.087 
30.051 
30.084 
30.069 
29.978 
30.039 
.052 
.046 
.109 
.057 
.062 
.072 
Mean Westerly Declination at Washington City. 
July. 
August. 
September. 
October. 
November. 
December. 
1° 21' 15".0 
l o H'43".0 
l°16 / 29".0 
9' 32".0 
1° 20'45".5 
1° 10'08".7 
1° 15' 27".1 
10'36".8 
1° 22' 47".0 
1° 12' 56".0 
1° 17' 51".5 
9' 51".0 
1° 20' 43".0 
1° 14' 49".0 
l°17 / 46".0 
5' 54" .0 
1° 21' 56".7 
1° 16' 43 y/ .8 
1° 19'20".2 
5' 12 /; .9 
1° 22' 51".0 
1° 17' 32".0 
1° 20' 11".5 
5' 19".0 
