266 Meteorological Observations at Hudson, Ohio. 
Arr. I1V.—Meteorological Observations made at Hudson, Ohio, 
- Lat. 41° 14 42” N., Long. 5h. 25m. 40s. W., during the years 
1841, ’2, 3, and ’4, with a summary for seven years ; by Ex1as 
Loomis, Professor of Mathematics and Natural Philosophy in 
the University of the city of New York. 
In Volume x11, pp. 3L0—330 of this Journal, is given a sum- 
mary of the Hudson observations for 1838, 39, and ’40. It is 
now proposed to continue this summary, and append the average 
results for seven years. The position of the instruments has 
throughout remained unchanged, and the same hours of obser- 
vation have been adhered to. During the past four years, not a 
single observation, except of the hygrometer, has been lost. 
They were all made by myself, with occasional exceptions, until 
October, 1843, from which time until July, 1844, they were made 
by Mr. 8. T. Seelye, a graduate of Western Reserve College. 
Those for August and September were made by Mr. Lemuel 
Bissel, and those for the next five months by Prof. Nooney. 
The year is considered as commencing with March. The fol- 
lowing observations of the barometer, are all corrected for capil- 
larity, and reduced to 32° 
BAROMETER. 
‘ 38 
Mean of (|£= Pressure of| Gaseous at-” 
Months 1841, 1842, 1843. 1844. seven years. £3 | the vapor. mosphere. 
M. | 3.36. sem. PF 29 3 P.M. 
March, 25 783/05 ii 857 751 7925 75 2S 8 ae 398°793 28°71 2 : 28°54: 
ril, | °786| -737 ‘687| ‘767 -933| -882 761 045) 
7 Teal 755} -79 751 814] *755 769 725 -044| 
783) -742| -805| -773| -843| -804| -792) -755-037) 
910| -879| -878| -837| 796 ‘856-822-034! 
919| -885 873 -779| -754| -876 -838-038, 
“903! -858) -900! -847) -936| -895| -893° -846 -047/ 
866} -809} -763| -738) -875| -832| -858|} -812.-046) 
-842| - 893} 870! -82 5| °851\ -806 045) 
864} +821) .879| -838| -767|. -723| -812| -774-033) 
815| -784| -789| -762| -819| -774| -823\ -785-033 
741|_-701| -876| -826| -796| -742| -817|_ 767-050) 
? \35-829 8-787 049) 7340| “B62. 0-499, 28 42) 
The mean dine oscillation is for spring 0437; for summer 
0363 ; for autumn -0460; and for winter -0420. It is least in 
summer and greatest in autumn. Average for the year -0420, 
differing but slightly from the results of the first three years. 
The mean pressure at Hudson for the seven years is 28°808. 
The reduction to the level of the sea is given below, to which I 
