831.] THEORY OF MOLECULAK VORTICES. 417
parts of the electromagnetic field. The problem of determining the mechanism required to establish a given species of connexion be tween the motions of the parts of a system always admits of an infinite number of solutions. Of these, some may be more clumsy or more complex than others, but all must satisfy the conditions of mechanism in general.
The folio wing results of the theory, however, are of higher value :
(1) Magnetic force is the effect of the centrifugal force of the vortices.
(2) Electromagnetic induction of currents is the effect of the forces called into play when the velocity of the vortices is changing.
(3) Electromotive force arises from the stress on the connecting mechanism.
(4) Electric displacement arises from the elastic yielding of the connecting mechanism.
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