On the Action of the Barometer in a Hurricane, etc. 21 
I will now give some facts which appear to prove that the tor- 
nado of the 30th did not exercise any influence at New Harmon 
' up to one and a half hours of its axial area reaching there. From 
a slight account of the barometric condition which existed over 
the United Sates at about the time of the occurrence of the tor- 
nado at New Harmony, for which account I acknowledge my ob- 
ligations to Professor Henry of the Smithsonian Institution, it 
v 
appears that in all the States in the basin of the Ohio, including 
Says is produced by the increasing rapidity of the leftwise rota- 
al area. Instead of the 
br navi d 
to those which T have recited, but who, apparently influenced by 
@ Popular belief, have failed to notice their significant bearing on 
the question 
idea of their origin, He says that the cyclones originate in the 
‘topics, and a0 tainly the pesalt of the mechanical gravitatior 
atmosphere as connected with the rotative and orbital 
