Effect of Rotation on the Barometer. 313 
its previous reduction. The contrary of this effect is sometimes 
_ seen in other storms. 
Thus, during successive days of the storm’s greatest activity, 
and while passing through twenty-five degrees of latitude and 
near twenty-three degrees of longitude, we find an extraordinary — 
barometric depression, the intensity of which increases rapidly 
as we approach towards the axial area of this great progressive 
whirlwind, coinciding, also, most remarkably, with the progress 
and intensity of the whirling action. We find, too, that the 
greatest intensity of the hurricane, and of its influence on the 
barometer, has no necessary connexion, or coincidence, with the 
local point of greatest rain or condensation; as clearly appears 
_ from recitals 38, 148, and other reports. Nor can any such coin- 
cidence at all lessen or contravene the known centrifugal force of 
Totation. 'T'o deny the proper influence of this force in rotatory 
Storms, would appear equivalent to a denial of the great law of 
_ Matter and motion to which the term is applied. 
_ The same law of centrifugal action must tend to produce an 
accumulation of pressure beyond the verge of the active whirl- 
_ Wind, or at least in the areas or spaces which separate distant 
_ Storms; a result which we have already viewed, in another con- 
Nexion, in the two October storms of 1842 and 1837. In the 
+ f¥esent case, the barometric curve, in front of the hurricane as 
_ Well as laterally, is found to blend with the more advanced and 
_ extended depression of the first Cuba gale ;f and if we view the 
two centers of depression as comprised in one great area of gyra- 
tive influence, the accumulated exterior pressure, or summit of 
barometric wave, will appear to be strongly exhibited, over a 
vast extent of surface, previous to the arrival of the storm, 
is is apparent from the various recitals previously given, and is 
shown more extensively by the barometric observations compri- 
_ Sed in Table IV, which is annexed. 
Me OS ee eee 
"It may be noticed that the barometric depression in this gale does not ae 
to increase according to the increase of latitude ; showing, that the ae Pe ae: 
of the centrifugal force of rotation are truly shown in the center path o ) 
Mm all latitudes. 
1 See Plate XI, figs. 21 and 22. 
Szconp Serizs, Vol. II, No. 6.—Nov., 1846. 41 
