68 W. A. Norton on Molecular Physics. 
This determines a flow of a certain portion of the electric ether 
around to that side; and a consequent positive polarization on 
that side of the gro up, or compound molecule. While this 
process of polarization is going on, there must then be a flow o 
electricity from one compound molecule to the next, in the same 
irection in which the transfer of ether occurs within the mole- 
cules Seer = an inevitable attendant upon the increasing 
polarization (p. 24 When the primary action becomes con- 
atant, there sap, abides - state of static polarization,—an 
eurrent may be either electric, or magnetic, so- called. 
crease of its action upon the ‘adjacent wire may result either 
from a closing of the circuit in the case of a ee cur- 
rent, or the magnetization of the iron when a magnet is em- 
Gira or from the approach of the current to the wire; or 
from a change i in the position of the wire in the magnetic field, 
attended with an augmentation in the action of the external im- 
pulsive force exerted by all the circular currents of the magnet. 
A decrease in the polarizing effect of the inducing current may 
result from an interruption ‘of the circuit, or a diminution in the 
force of the magnet, or a recess of the wire from the current, or 
a movement of the wire in the magnetic field attended with a 
diminished action of the entire impulsive force of the magnet. 
The oppositely directed currents induced by alternately clos- 
ing and breaking the galvanic circuit, when the two contiguous 
wires are to a hollow coil, are greatly augmented by 
inserting rods, or bundles of iron wire within the coil. The 
explanation of this is, doubtless, that the direct action of the 
galvanic current is reénforced by the magnetic currents which 
it develops in the iron. The other cases of induction above 
referred to need not be dwelt upon, with the exception of that 
resulting se the movement of a wire to different points of the 
This e: case has been subjected to a rigorous experimental anal 
sis by Faraday, who has deduced from his researches the follow: : 
ing general results. If a wire, forming part of a closed circuit, 
be held in a direction transverse to a magnet, and moved in the 
one pear across. es 0 force, a current in a certain 
direction will arise, and f it Kbe moved across them in the other © 
The The quantit of electricity set in motion will: de d upon 
of Lines of eta crossed by the ine aia, a not 
