’ 
178 Phenomena of the Cuba Hurricane. 
ferring nearly all northeasterly and northwesterly winds to the 
northeast and northwest points specifically. 
Perhaps we may estimate the average of the vorticose con- 
vergence, as observed in the entire storm for three successive days, 
at from five to ten degrees,—out of the ninety degrees which 
would be requisite for a congeries of centripetal_or center-blowing 
winds. This rough estimate of the degree of involution is | 
founded only on a bird’s eye view of the plotted observations. 
But however estimated, this involution seems to afford a measure 
of the air and vapor which finds its way to a higher elevation by 
means of the vortical movement in the body of the storm. It 
probably finds its limit at various and unequal distances from the 
general cenier of revolution, and at a very moderate clevation 
from the earth’s surface ; according to the existing conditions and 
activity of the storm. That it does not commonly extend over 
the entire area of central inactivity, which is found at the earth’s 
surface, may be inferred from the general absence of rain, and 
sometimes even of clouds, in this axial area of the storm. 
_ Osservep Direction or THE SToRM-Scups.—It may be of some 
importance to notice, that, so far as can be settled by my own 
observations of the storms of the United States, the directions of 
scuds which fly in the most active portion of the gale, inter- 
mediately between the earth’s surface and the great stratus cloud 
which overlies the gale, and below any regular cloud stratum, 
have generally no inward inclination in their course, as regar 
the gale’s axis; but rather the contrary. By careful observa 
tions, these sends are commonly found to fly from directions 
which are from half a point to one or two points more to the 
right, on the compass card, than the direction of the storm-wind 
at the earth’s surface. The elevation of these floating seuds is 
also comparatively small; and in the rainy portions of the gale, 
appears chiefly comprised in a range from five hundred to twenty- 
five hundred feet above the surface. 
These results are nearly alike common; whether the observer 
be placed on the axis path of the storm, or on the right or left 
side of this path; and are found in a large portion of the true 
storm-winds, from the north round by the east to the southwest. — 
If there are some apparent exceptions, arising from irregularities 
in the —— or Secs aa a or foam piensa of scuds 
