) 
| 
EH. §. Whitfield on Tornadoes in the Southern States. 108 
pher must at once perceive that, under such conditions, no cur- 
rents could either ascend or descend ; the “ specifically ” hotter, 
and therefore lighter air, at the top, could not possibly come 
down, because it would become sensibly hotter, and therefore 
lighter than the air below; and the “ specifically ” colder air at 
the surface could never rise, for a corresponding reason. 
€xpansion in the vortex, its temperature is reduced ten fold, so 
that the vapor of the air rushing in from below is mstantane- 
ously frozen, 
storms and secondary tornadoes many leagues distant from its 
Path. Its hodissitnin force is due to the concentrated momen- 
of all the currents moving to the common center; is the 
