Rates of Progression of certain Storms. oe: 
tween a general rectilinear wind, on one hand, or the lately alle- 
ged centripetal winds, on the other. The degree of vorticular 
inclination in violent storms must be subject, locally, to great va- 
riations; but it is not probable that, on an average of the differ- 
ent sides, it ever comes near to forty five degrees from the tan- 
gent of a circle,—and that such average inclination ever exceeds 
two points of the compass, may well be doubted. 
Second Hurricane of September, 1842. 
Between the 18th and 22d of September another storm of vio- 
lent character crossed the Gulf of Mexico, probably in a north- 
easterly direction and at a slow rate of progress; but I have not 
sufficient means for tracing its further advance with much ac- 
curacy. This storm also occasioned much injury to the vessels 
which were exposed to its violence. 
Rate of Progression in Storms observed only in the Tropical and 
. Lower Latitudes. 
In the following table I have presented some of the principal 
facts relating to the progress of four several storms of the Ameri- 
can seas, the courses of which have been observed only in the 
lower latitudes. I have also added to this table a storm of the 
Bengal Sea and Indian Ocean, described by Mr. Pippineron in 
his Eighth Memoir on the Law of Storms in India. This storm 
is also distinguished as having moved nearly to the west, but in 
much lower latitudes than the Anéje’s hurricane. 
7 =f8 SS eS Casillas 
: ae $1 on aed ous + 8 
sae | S a &3 #3 
23} Date of Storm. Es gL ez2 Se ce 
is See a $38 Se% Ee 
ra I pert os o © 
oe Bes | S28 | ses | S82 | Sse 
I. \June 23d—27th, 1831. |n. 74° w.|14° 30’. Right to Left.|1900 miles. 185 miles. 
IL. |Aug. 10th—17th, 1831. _[n. 64° w./20°30'n., * “2160 “ [144 # 
V. |Aug. 12th—18th, 1835. |. 73° w./21° 45’w.| “ “ 165 
XII| Aug. 30th—Sept. 9th, 1842.) w. 23° 45’ Nn] og Mo OSs * 
(Oct. 22d—Nov. Het, 1842, | w. lige nj * / * | « 19 
The average progression of the four American storms of this 
table somewhat exceeds fifteen miles an hour. It will be seen 
that the East Indian storm advanced only at the rate of nine miles 
per hour, which is one of the slowest rates yet observed, and is 
much below the average rate of progression of storms in the Asiatic 
