Dr. Hare on the Theories of Electrical Phenomena. 235 
pulsive. co ; 
21. Agreeably to Ampeére, an iron bar, situated within a coil of 
Wire subjected to a galvanic current, is magnetized, because the 
current, in the wire, is productive of an electrical whirlpool about 
every particle of the metal. When the iron is soft, the magnet- 
ism, and of course the gyrations of which its magnetism consists 
by the premises, cease for the most part as soon as the circuit 
through the coil is broken; but when the iron is in the more rigid 
state of hardened steel, the gyrations continue for any length of 
time after the exciting cause has ceased. mar 
22. This theory does not explain wherefore the hardening 
the steel should cause the gyration to be more difficult to induce, 
yet more lasting when its induction is effected. Exidently the 
metallic particles must take some part in the process; since it + 
dependent, for its existence and endurance, upon their nature an 
their state. Yet no function is assig to these particles. In 
fact, it is inconceivable, either that they can participate in, or con- 
tribute to th sed gyration. 
23. The ae uid. in an iron bar, cannot form a vortex 
about each particle, all the vortices turning in one direction, 
Without a conflict between those which are contiguous. In 
order not to conflict with each other, the alternate vortices would 
Srcoxp Senizs, Vol. V, No. 14.—March, 1848. 
