- On the Gales and Hurricanes of the Western Atlantic. 125 
and New Jersey, on the 8th; and the states of Massachusetts, New 
Hampshire and Maine on the 9th; being on the highlands of New 
Hampshire, a violent snow storm. The destructive action of this 
storm was widely extended on both sides of the track indi¢ated upon 
the chart, and the same fact pertains, in a greater or less degree, to 
the other storms herein mentioned. It appears to have passed from 
Martinico, and the other Windward Islands, to Boston in Massachu- 
setts by the usual curvilinear route, in about six days; a distance of 
more than 2,200 miles, at an average progress of about 154 miles 
per hour. , 
— No. VI, is that of the memorable gale of August, 1830, 
which, passing close by the Windward Islands, visited St. Thomas’ 
on the 12th; was near Turks’ Island on the 13th; at the Bahamas 
on the 14th; on the gulf and coast of Florida on the 15th ; along 
the coast of Georgia and the Carolinas on the 16th; off Virginia, 
Jaryland, New Jersey, and New York on the 17th; off George’s 
Bank and Cape Sable on the 18th; and over the Porpoise and New- 
foundland Banks on the 19th of the same month; having occupied 
| about seven days in its ascertained course from near the Windward 
/ Islands, a distance of more than three thousand miles; the rate of its 
progress being equal to eighteen miles an hour.* If we suppose the 
actual velocity of the wind, in its rotary movement, to be five times 
greater than this rate of progress, which is not beyond the known 
velocity of such winds, it will be found equal, in this period, toa — 
rectilinear course of fifteen thousand miles. The same remark ap- 
plies, in substance, to all the storms which are passing under our 
review. What stronger evidence of the rotative action can be re- 
quired, than is afforded by this single consideration ? 
- Route No. VIL, is that of an extensive gale, or hurricane, which 
swept over the Western Atlantic in 1830, and which was encoun- 
tered to the northward of the West India Islands on the 29th of Sep- 
tember. It passed on a more eastern route than any which we have 
occasion to describe, to the vicinity of the grand Bank of Newfound- 
land, where it was found on the 2d of October, having caused great 
damage and destruction on its widely extended track, to the many 
vessels which fell on its way. Its course is quite analogous to that 
which we have considered as having been probably pursued by the 
_ * Fora more extended notice of this storm, see American Journal of Science, 
Vol. xx. pp. 34—38. 
