158 Synopsis of a Meterological Journal. 
‘The irregular and more striking variations of the mercurial column 
as connected with the prevailing atmospheric phenomena, cannot be 
shown in this summary, but would require a transcript of the entire 
journal. The regular semidiurnal or horary oscillations of the mer- 
cury are, however, distinctly manifested by these observations, al- 
though not made at the hours considered most favorable to that ob- 
ject. It will be seen that the mean range of this regular oscillation, 
as between 10 A. M. and 6 P. M., is .039 inches. 
The annual mean of the mercurial column as deduced from all 
the observations is 30.033 inches. 
During the first five months of the year, the indications of the 
barometer may have been slightly reduced by a trifling inclination 
in its position occasioned by the weight of mercury in the basin. 
Measures were then taken to prevent the recurrence of this derange- 
ment. 
Table of the mean height of the Barometer, at the hours there- 
in mentioned. 
fs 1834. 6A. M. 13 OA. MM. SPM. Pa OP. M. |Monthly mean. 
January, . . 30. 230/30.250 30.223 30.230 30.256) 30.239 ° 
February, . . 30. 118'30.176 30.123 30. 11830. 126, 30.133 
March, — 30 193 30.246 30.184.30.153 30.199) 30.195 
April, . . 30.084.30.108 30.072 30.052 30.073, 30.078 
May, ame 30 020/30.050 30.035 30.01930.049 30.035 
June, - . |29,899/29.932 29.919'29.918 29.942) 29,993 
July, - .  |80.084/30.105 30.062 30.065 30.073; 30.078 
August, . . (30.030'30.047 30.033'30.01830.034; 30.033 
September,. . 30.17530.18130.154'30.138 30.127) 30.162 
October, . . (30.19330.19630.168'30.15930.196 30.182 
November,. . |30.091'30.11730.07830.07930.098 30.094 
December,. . 30.146)30.17730.131/30.14730.203, 30.161 
Annual means. 30.106)30.133 30.099 30.092 30.118 
Mean range of the semi-diurnal oscillation, as between 10 A. M. 
and 6 P.M. : 041 eis 
Mean of the two years 1833 and 1834, .040 
Mean of os the observations in 1834, , SO0.AAs-...f8 
Do. & “in 1833 and 1834, 30.07 re 
