THE LAW OF STORMS. 5 



Thus, a complete revolution of the wind-vane in the 



3rthern Hemisphere is therefore S. W., N. E., S. 

 ^ith the sun, and in the Southern Hemisphere the rota- 

 tion is S. E., N. W., S., with the sun, also, in that re- 

 gion. 



When the course of a steady wind is obstructed in 

 such a manner as to produce a Hurricane, or Cyclone, 

 the wind has a rotary or whirling motion (as it were, 

 on an axis), while the storm itself has a progressive 

 motion. 



N. B. — The rotation of the wind during a hurricane, 

 in the Northern Hemisphere, is in a direction contrary 

 to that in which the hands of a watch move. In the 

 Southern Hemisphere, the rotation is in the same 

 direction as that of the hands of a watch. And 

 hence the following shiftings of the vane: In the 

 Northern Hemisphere, when the vortex (or center) of 

 the storm passes to the westward of the place of obser- 

 vation, the rotation is S. W., N. E., S., with the sun ; 

 when the vortex passes to the eastward of the place of 

 observation, the rotation is S. E., N. W., S., against 

 the sun. 



In the Southern Hemisphere, if the vortex passes to 

 the westward of the place of observation, the rotation 

 is S. E., N. W., S,, with the sun. 



If the vortex passes to the eastward of the place of 

 observation, the rotation is S. W., N. E., S., against the 

 sun. 



On Hurricanes or Cyclones* 



Thus, in both Hemispheres, the passage of an equa- 

 torial whirlwind storm on the west side of the place of 



