DOVE ON THE LAW OF STORMS. 209 
_George’s Bank and Cape Sable on the 18th, and the banks of 
Newfoundland on the 19th: it advanced therefore eighteen 
‘miles an hour. Now if we take the actual velocity of the wind 
in its rotatory direction .as five times greater than the progress- 
ive movement of the storm, we have the air moving through 
18,000 miles in seven days. 
The most eastern storm was that of the 29th of September, 
1830. Beginning to the north of Barbadoes in the 20th degree 
of latitude, in long. 68° lat. 30°, its course became northerly, and 
subsequently, after passing to the west of the Bermudas, north- 
easterly until on the 2nd of October it reached the east end of 
the banks of Newfoundland. 
A very violent storm, but of much less diameter than the 
preceding, prevailed at Turk Islands on the Ist of September, 
1821. On the following day it was felt north of the Bahamas, 
-early on the 3rd it reached the coast of the Carolinas, later in 
the day New York and Long Island, and in the following night 
it passed over the states of Connecticut, Massachusetts, New 
Hampshire and Maine, a course of 1800 miles in sixty hours: 
_ its mean velocity was therefore thirty miles an hour. 
The course of the storm of the 28th of September, 1838, was 
similar to the one last described. The storm of the 22nd of 
August, 1830, was much slower in its progress. It began in 
lat. 20° to the north of Porto Rico, and preserving about the 
same distance from the coast of North America, reached the 
banks of Newfoundland on the 27th*. 
The explanation of these phenomena appears to be the follow- 
Fig. 3. ing:—Letad(Fig.3.) becon- 
e fi E f g * sidered to represent a series 
PEs . . 
Has of material points parallel 
cai to the equator; supposing 
AG these points to receive from 
a any cause whatever an im- 
pulse in the direction a c 
4 b towards the north, then, 
inasmuch as they would be transferred from greater to lesser 
* As the direction in which the storm is advancing is quite a different thing 
from the direction in which the rotating current may be blowing at a given 
place, it is easy to see what incorrect conclusions might be arrived at by an 
exclusive consideration of observations merely local. Thus Raynal in his 
Histoire Philosophique et Politique des deux Indes, vol. v. p. 72, savs that re- 
cent observers had noticed that the storms which had ravaged the Antilles from 
