spect different to the induction exerted by
electricity of tension. If so, the state may be assumed in liquids when no
electrical current is sensible, and even in non-conductors; the current
itself, when it occurs, being as it were a contingency due to the existence
of conducting power, and the momentary propulsive force exerted by the
particles during their arrangement. Even when conducting power is equal,
the currents of electricity, which as yet are the only indicators of this
state, may be unequal, because of differences as to numbers, size,
electrical condition, &c. &c. in the particles themselves. It will only be
after the laws which govern this new state are ascertained, that we shall
be able to predict what is the true condition of, and what are the
electrical results obtainable from, any particular substance.

74. The current of electricity which induces the electro-tonic state in a
neighbouring wire, probably induces that state also in its own wire; for
when by a current in one wire a collateral wire is made electro-tonic, the
latter state is not rendered any way incompatible or interfering with a
current of electricity passing through it (62.). If, therefore, the current
were sent through the second wire instead of the first, it does not seem
probable that its inducing action upon the second would be less, but on the
contrary more, because the distance between the agent and the matter acted
upon would be very greatly diminished. A copper bolt had its extremities
connected with a galvanometer, and then the poles of a battery of one
hundred pairs of plates connected with the bolt, so as to send the current
through it; the voltaic circuit was then suddenly broken, and the
galvanometer observed for any indications of a return current through the
copper bolt due to the discharge of its supposed electro-tonic state. No
effect of the kind was obtained, nor indeed, for two reasons, ought it to
be expected; for first, as the cessation of induction and the discharge of
the electro-tonic condition are simultaneous, and not successive, the
return current would only be equivalent to the neutralization of the last
portion of the inducing current, and would not therefore show any
alteration of direction; or assuming that time did intervene, and that the
latter current was really distinct from the former, its short, sudden
character (12. 26.) would prevent it from being thus recognised.

75. No difficulty arises, I think, in