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 indicated 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 15 J miles 

 per hour. 



Track 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, 

 Maryland, New Jersey, and New York on the ]7th; 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, to a 

 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. VII, is that of an extensive gale, or hurricane, which 

 swept over the Western Atlantic in 1 830, 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 



* For a more extended notice of this slorm, see American Journal of Science, 

 VoL XX. pp. 34— 38. 



