through a wire does not produce analogous phenomena to those arising from
voltaic electricity; but as it appears impossible to separate the effects
produced at the moment when the discharge begins to pass, from the equal
and contrary effects produced when it ceases to pass (16.), inasmuch as
with ordinary electricity these periods are simultaneous, so there can be
scarcely any hope that in this form of the experiment they can be
perceived.

26. Hence it is evident that currents of voltaic electricity present
phenomena of induction somewhat analogous to those produced by electricity
of tension, although, as will be seen hereafter, many differences exist
between them. The result is the production of other currents, (but which
are only momentary,) parallel, or tending to parallelism, with the inducing
current. By reference to the poles of the needle formed in the indicating
helix (13. 14.) and to the deflections of the galvanometer-needle (11.), it
was found in all cases that the induced current, produced by the first
action of the inducing current, was in the contrary direction to the
latter, but that the current produced by the cessation of the inducing
current was in the same direction (19.). For the purpose of avoiding
periphrasis, I propose to call this action of the current from the voltaic
battery, _volta-electric induction_. The properties of the second wire,
after induction has developed the first current, and whilst the electricity
from the battery continues to flow through its inducing neighbour (10.
18.), constitute a peculiar electric condition, the consideration of which
will be resumed hereafter (60.). All these results have been obtained with
a voltaic apparatus consisting of a single pair of plates.


§ 2. _Evolution of Electricity from Magnetism._