_When the conducting cords are of equal length_, as commonly they should
be, each of the two poles or electrodes produces a polar effect in the
patient directly the opposite of that produced by the other. Also, _at
any point_ in either half of the circuit, if it be within the person of
the patient, the polar effect produced is the very reverse of what is
experienced at the corresponding point in the other half of the circuit.
And further; each half of the current produces a polar effect, at every
point in the parts of the patient through which it runs, the same in
_kind_, though differing in _degree_, as is produced immediately under
the pole or electrode with which it is connected; yet an effect
antagonistic to that which is produced under the other pole, or at the
corresponding point in the other half of the current.