taken from the magnet (50. 55.), the direct or inverted current of induced
electricity continues for the time occupied in the advance or recession;
for the electro-tonic state is rising to a higher or falling to a lower
degree during that time, and the change is accompanied by its corresponding
evolution of electricity; but these form no objections to the opinion that
the electro-tonic state is instantly assumed.

71. This peculiar state appears to be a state of tension, and may be
considered as _equivalent_ to a current of electricity, at least equal to
that produced either when the condition is induced or destroyed. The
current evolved, however, first or last, is not to be considered a measure
of the degree of tension to which the electro-tonic state has risen; for as
the metal retains its conducting powers unimpaired (65.), and as the
electricity evolved is but for a moment, (the peculiar state being
instantly assumed and lost (68.),) the electricity which may be led away by
long wire conductors, offering obstruction in their substance proportionate
to their small lateral and extensive linear dimensions, can be but a very
small portion of that really evolved within the mass at the moment it
assumes this condition. Insulated helices and portions of metal instantly
assumed the state; and no traces of electricity could be discovered in
them, however quickly the contact with the electrometer was made, after
they were put under induction, either by the current from the battery or
the magnet. A single drop of water or a small piece of moistened paper (23.
56.) was obstacle sufficient to stop the current through the conductors,
the electricity evolved returning to a state of equilibrium through the
metal itself, and consequently in an unobserved manner.

72. The tension of this state may therefore be comparatively very great.
But whether great or small, it is hardly conceivable that it should exist
without exerting a reaction upon the original inducing current, and
producing equilibrium of some kind. It might be anticipated that this would
give rise to a retardation of the original current; but I have not been
able to ascertain that this is the case. Neither have I in any other way as
yet been able to distinguish effects attributable to such a reaction.

73. All the results favour the notion that the electro-tonic state relates
to the particles, and not to the mass, of the wire or substance under
induction, being in that re