270 Meteorological Observations at Hudson, Olio. 
Date. Barometer. Oscillation. 
1843, Jan. 8,9 a.m. 28269 . 
cf “ SO. Ea. 28-686 ‘A17 in 6 hours. 
ve 9,9 a.m. 29-014 ‘745 in 24 hours. 
‘« . Feb? 10, 9) acm, 28:812 f Rs 
te ts 10, 93 P.M. 28:097* Fla in 124 hours. 
Mare 2/, 9 a. Mw 28:728 ; 
( a 28, 73 ‘a We. 297-84] ‘887 in 23 hours. 
i CPB yO A Me 27:848 ‘ 
ét a 3 90) 9, que 98-794 ‘946 in 24 hours. 
1844, Jan. 12,9 a.m = 28692 : 
Gi oe 6 dS Oi, ROBO, Oe ae 
o> Dee.) 63.9: attr 28°345 
Zz fe Bi Oia ne. 99-117 ‘772 in 24 hours. 
1845, Jan. 13,9 a.m. 28-218 ; 
; ‘704 in 24 hours. 
cei 0. WA Ohne e'dBrgpp An Aae = emma 
o < 17, 3 Pe 28°450 . 
; ‘724 in 24 hours. 
oo tO ABS tthe 2047.0 i dae an 
The greatest range in 24 hours, for the entire period of seven 
years, was ‘946, March 28, 1843. Only four cases have occur- 
red in which the fluctuations amounted to ‘8 inch in 24 hours. 
The season of the year in which these maxima, minima, and 
extraordinary fluctuations have occurred during seven years is 
shown in the following table. 
Maxima. Minima. Fluctuations. 
October, 3 2 0 
November, 5 4 1 
December, 5 6 5 
January, A 5 8 
February, 2 4A 5 
March, 5 A 4 
April, 2 iL i) 
May, 0 2 0 
* About the time of minimum, the column of mercury was very unsteady, 
oscillating through an are of from -02 to -03 inch. This motion was not due to 
agitation of the tube, but to sudden changes of pressure, and resembled very 
much the respiration of an animal. On the 14th of August, 1843, just at the 
commencement of a shower the barometer oscillated through -073 inch. Cases of 
this kind are not uncommon. 
