electro-magnetic Aether forming currents around each electro-magnet. On
the hypothesis of an atomic and gravitating Aether we have, therefore, a
medium or body continually circulating, which medium possesses inertia
and momentum, and it is philosophically possible for such a rotating
medium to possess kinetic energy. So that our explanation of this term,
as used by Clerk Maxwell, is, that this kinetic energy is indeed due to
the momentum of the moving Aether. Such a hypothesis is strictly
philosophical, and literally fulfils the statements made by Clerk
Maxwell himself in the paragraphs already referred to.

A remarkable feature about this hypothesis lies in the fact, that it is
the very hypothesis that Von Helmholtz suggested as the explanation of
the term. He came to the conclusion that the kinetic energy was due to
the momentum of the moving Aether. But with a frictionless Aether such a
hypothesis, although correct, was philosophically untenable. In view of
the theory of the Aether presented in this work, however, both Clerk
Maxwell's and Von Helmholtz's statements find their literal and perfect
fulfilment. So that in an atomic Aether, which is gravitative because
atomic, and rotatory because it is gravitative, combined with its
electro-magnetic basis as proved by Hertz, we find for the first time a
correct philosophical explanation of one of the most puzzling terms used
by Maxwell in his greatest work on _Magnetism and Electricity_. This
solution alone ought to stamp the theory of an atomic and gravitating
electro-magnetic Aether with that authority that is always associated
with the names of two such great thinkers and experimentalists as those
just mentioned.

The fact that the Aether is held bound to a planet has already been
suggested by Sir G. Stokes to account for the aberration of light
already referred to. In the _Phil. Mag._, July 1845, he writes: "I shall
suppose that the earth and the planets carry a portion of Aether along
with them, so that the Aether close to the surface is at rest relatively
to the earth, while its velocity alters as we recede from its surface,
till at no great distance it is at rest in space." Sir G. Stokes does
not, however, say how the Aether is held bound to the earth, and apart
from an Aether which is gravitative, no satisfactory explanation can be
given. Further, it is noticeable, that he suggests that the other
planets also carry part of the Aether associated with them along wi