320 Storm Winds which preceded the Hurricane. 
creased, apparently, by the subsidence or vorticular depression of 
the higher and colder currents on the posterior or western side of 
the gale. Indeed, this rising of the thermometer during the ac- 
cess of winter storms, and its great depression as they pass off in 
their northeasterly courses, might in itself afford us good proof 
of the storm’s rotation, were more direct evidence wanting. 
In summer, when the geographical distribution of temperature 
on the path of the storm is more equal, the case is greatly altered, 
and a sinking of the thermometer is not unfrequently noticed in 
the earlier portions of the storm. The mean temperature of the 
several storms, is then often below that of the periods between 
the storms. Thus, while the general course and revolving char- 
acter of North American storms, at all seasons of the year, are 
essentially the same, the picneenens and ranges of their: tempe- 
ratures are greatly varied in the different seasons. 
Winps or THe two Precursory Storms.—The axis of the first 
Cuba gale, in its early progress, seems to have advanced ona 
more inflected route than that of the subsequent hurricane, and 
having passed to the southward and westward of the island of 
Jamaica, it appears to have crossed thg north shore of Cubaat — 
some point eastward of long. 80°. It seems to have partially aba-_ 
ted in its visible force in approaching the ‘parallel of 30°, at least 
on its left and central portions, till it arrived near lat 40°, from 
whence onward it appears increasing in activity and extension. 
Its revolving character, when below the tropics, seems fully made 
out by observations on its different sides; and, during its course 
in higher latitudes, its right hand portion. prsats nearly the same 
winds and. consecutive changes that characterized the like portion 
of the Cuba hurricane. Its more central-portions also, exhibite 
southeasterly winds, followed in the higher latitudes by north- 
westerly ; while, in the eastern states of the American Union, it8_ 
northerly winds appear to have been partly intercepted by the 
passing storm from the lakes, and by the closely following hurti- 
cane; a result which I have several times observed, in similar 
cases. 
In regard to the pee of the Lake storm, it may suffice to 20 
tice that they. were chiefly southeasterly in the earlier part of the «| 
storm, in the basin of the great Lakes, ome northwesterly or north- 
~ erly during its later periods ;—sometimes strong, and_at other 
a and Snctosting in dietion. At Hapane & age 
