IN THE MONTH OF FEBRUARY, 1842. 169 
February 1. February 2. February 3. February 4. Feb. 5. 
Jineinnati, Ww. Ss. Ww. S.W. 8. W. SW. (8. WwW. W.S.W. 
Hudson, W.N.W. W. 8.8. W. |S. W. W.S.W.|S.E. rain. Ss. W.N.W 
Meadville, w. S. s. 8. W.N.W 
Brie, Ww. W.S.W W.S.W. } Ww. ‘ WwW. W.S.W.) N.W. 
Pittsburgh, Ss. W. S.W. Ss. W. W.S.WJUENE.$ SF N.W. 
i Franklin, S. E. N.W. 
a Union, Ss. W. S. W S. W. S.W. |S. W. Ss. WwW. IN.W. 
i ‘Toronto, Ww. WwW. W. S. W. W. Ww. S.E. rain. E. rain. N.W. 
Bedford, N.W Ss. W S. W. S.W. |S. W. Ss. W. N.W. 
Bellefonte, Ww. Ww. Ww. Ww. 
Mifflintown, S.W. S.W. 8. W. w. N.W. 
Gettysburgh, W. W. S. S.S.W.|S.S.W. S. WwW. Ww. 
Carlisle, N. W. WwW Ss. W S.W. |S. W. Ww. N.W. 
Northumberland] N. W. W. N.W. |S. W S.W. W. S | N.W. 
Port Carbon, N. 8 8. W. N.W. 
Lancaster, W. S. W 8. W. N.W. 
West Chester, W. W. S 8 Ss. WwW 5. W. Ww. 
Haverford, W N.W. W. W.S.W. W. S. W. W.S.W N.W. 
Philadelphia, Ww. W. s S.W. 8.S.W. s. W.S.W. 
Ww. V. § W. 
New York, .|N.W. Ww. W. 1m t } oe t ; wae w. Ww 
Middletown, N.N. W.) W. W. Ss. W. Ss. W. Ww. W. Ww 
: 6 N.W, * 
Amherst, N. W. OW! Tea iw. t [N.W 
' This table exhibits a remarkable uniformity; the direction being almost invariably 
from the west. Only six observations in one hundred and forty-six are from the east, 
and, in one of these cases, higher clouds were seen from the west, and in each of the 
other cases rain was falling. ‘These observations indicate the direction of the wind in 
the region of the clouds observed. When rain is falling, the clouds are usually low, and 
have nearly the direction of the wind at the surface, although a higher current may still 
be blowing from a different direction. There seems, then, no room to doubt that through- 
out the entire period of these observations a westerly wind prevailed at a certain elevation 
from the earth’s surface. The following observations of the dew point at Hudson afford 
some data for judging of this elevation. 
Comp.Temp. dew point.| Height of Clouds. | Direction. 
| Habs 1,3 P.M. 9° 5’ 950 Yards. ie N.W. 
/ 2,9 A.M. 8 4 840 
| lead elt iN 5 4 540 s. 8. W. 
“« 3,9 A.M. 10 100 Ss. W. 
1. BrP ML, 4 0 400 W.S.W. 
“« 4,9 A.M. 0 0 000 S. E. 
«4 3P.M, 5 6 560 ‘ 
“ 6,9 A.M. L2% 120 W. N.W. 
It will be perceived that these clouds were all quite low, the highest southerly cloud 
being a third of a mile in elevation. It is inferred that at an elevation of a mile or so, 
the winds were invariably from some western quarter. 
| With this general review of the facts respecting these two storms, let us proceed to a 
more particular consideration of their causes. 
VOL. IX.—46 
