1912-13.] Electrical Resistance and Magnetization of Nickel. 219 
hardly be expected to co-ordinate the more complex relations established 
in this paper. With an experimental knowledge of these relations it may, 
however, be possible to gain some insight into the mutual action of the 
molecules and the electrons or corpuscles which carry the electric charge 
and constitute the current. 
In a magnetic metal like nickel we seem compelled to regard the 
molecules as small electro-magnets consisting of whirls of negatively 
charged corpuscles. The simplest molecular magnet of this kind is the 
doublet, in which the negatively charged corpuscle rotates with high 
speed round the more massive positive associate, whose speed is corre- 
spondingly small. In the unmagnetized condition of the metal these 
molecular whirls will form magnetically neutral groups, so that the 
intermolecular spaces will be comparatively free from magnetic force. 
When, however, an external magnetic field acts upon the metal, the 
groups are more or less broken up and the molecular whirls tend to set 
so as to face in a definite direction. The intermolecular spaces will become 
filled with tubes of magnetic force tending to thread the doublets or whatever 
particular form the molecular magnets have. Any electron in rapid 
motion through this intermolecular space will be driven by this established 
magnetic field in a direction at right angles to the magnetic force and to 
its own velocity. 
In the first place, let the conductor be magnetized longitudinally, that 
is, in the direction in which the resistance is being measured. The tubes 
of magnetic force will tend to pass along either in the same direction as, or 
in the opposite direction to, the drift of the negatively charged electrons. 
These electrons will tend to describe helices round the lines of magnetic 
force, and will be driven from the regions where the magnetic force is 
stronger to the regions where it is weaker. Being thus driven out of the 
lanes of strong magnetic force which pass through the hearts of the 
molecular magnetic whirls, they may well be imagined as colliding more 
frequently with the more obstructive parts of the molecules. The free path 
will therefore be diminished and the resistance increased. Whether this 
may be accepted as a reasonable explanation or not, it is clear that the 
effect of a longitudinal field upon the molecular grouping must be such as 
to put impediments in the paths of the drifting electrons. 
Under the influence of the transverse field, the tubes of magnetic force 
in the intermolecular spaces run across the nickel strip at right angles to 
the drift of electrons by which the current is conveyed. 
The negative electrons will tend to pass towards one side, and the more 
massive positive electrons to pass towards the other. Will this remove 
