96 4H. S Whitfield on Tornadoes in the Southern States. 
and the Vorticello Oxy-trichans (through the mediation of the 7 
“oyster” or ‘ porte-monnaie-grub”), there occur frequently | 
some analogous forms, such as “ Kerona” and “'Trachelium. t 
The last form of all to appear in infusions, etc., seems to be | 
the well-known Rotifer, the developments whereof are perhaps — 
related to some of those above detailed. It is, however, most — 
robable, according to the observations of Prof. L. Agassiz 
Art. XIIL—Tornadoes of the Southern States; by HAMPTON 
WHITFIELD, Professor of Mathematics in the University of 
Alabama. 
Tur tornado is a storm which has two distinct movements, 
the one progressive along the surface of the earth, the other 
gyratory, like that of a top spinning on its axis. It whirls a 
it goes and its force is so great that no structure of wood, brick 
in this country is very narrow. I have not yet found traces 
any one exceeding two hundred yards in breadth 
_* This is no doubt what g d describe as the “adult Parameciv? 
the impression that which I had formerly frequently observed 
: it was this fc 
a 
