Prof. Loomis’s Storm of December 1836. 187 
but ‘91in. If the true course of the storm had been from west 
to east, the fall in the barometer would have been much the 
greatest on the Atlantic border; owing to the lower level, which 
is not considered and allowed for in the above estimate, and toa 
less obstructed rotation of the storm, on reaching the Atlantic.* 
Moreover, the barometric minimum was observed at Quebec 
about as early, on the 21st, as at New York and its vicinity; al- 
though 420 miles further to the north, and nearly on the same 
meridian. This more rapid advance of the central portion of the 
storm, which has been seen in other cases, proves that the true 
course of progression was on the general route which I have in- 
®ha may be traced in every great cyclone that passes over these 
latitudes. his eastward extension appears due, in part, to the 
tially change the rotative movement; as may be seen by the con- 
Unued lopment of the cyclonic winds, and their influence 
on the barometer, : # 
it Is well known that other and similar tracings from gid 
t have been raade of the progress -of various storms 1n the 
* The extreme i riod of seven years at Hudson, O., 
range of the barometer in a pe : ie 
Lato Twinsbur 2 ea about 1100 feet above tide, as given by oF gp mga 
. (19 in.: while the range observed in New York during the same perioe’, > 
in. _ Difference, 531. The mean of the annual ra' at Hudson during the same 
nel d be added to prisae Pee of the- rel ind in some of the western ob- 
ith i i no 
Bs on the Atlantic border in the same storm, 
Journal, vols, i, and ii, New Series, 1846. 
