n, which would
give rise to those conditions by which any body within its influence may
be formed into a magnet.

Our hypothesis, therefore, to explain the reason why all the planets and
the sun are magnets, is that the electro-magnetic Aether moves round the
sun or planet or satellite as the case may be, thus giving rise to
currents of electricity around the planet or sun, and so forming those
conditions in the Aether by which the permanency of any planetary or
stellar magnetism may be maintained and perpetuated.

In other words, to put it plainly and tersely, each aetherial atmosphere
revolves round the planet, subject to certain limitations, in the same
way that the aerial atmosphere turns round with the earth, as that
planet revolves on its axis. At first sight, such an assumption may seem
impossible, but a little careful consideration will show not only the
possibility of such a cause, but will establish it, as the only
reasonable and philosophical explanation for the phenomena we are
seeking to explain, viz. the electro-magnetism of all celestial bodies.

There is nothing extravagant in this assumption, as we already have a
similar illustration in the case of the atmosphere which goes round with
the earth as it revolves on its axis. We have only to extend the same
principle a little further, viz. to the aetherial atmosphere, and we at
once get the true physical conception of the hypothesis suggested to
explain the magnetism of all celestial bodies. We have already learned
that Maxwell has proved that the equations for moving magnetic bodies
are the same as those for stationary bodies, from which we came to the
conclusion that the electric and magnetic field of any planet goes with
that planet as it revolves on its axis in its journey round the sun.

I would like to ask the reader to try to conceive of any electric or
magnetic field traversing space in association with any planet or sun
which is revolving on its axis, while that electric or magnetic field
does not revolve either partially or wholly with the revolving body. The
field can only be stationary relatively to the planet or sun, as it
revolves with the planet or sun on its axis.

There may be, as there doubtless are, conditions governing that
revolution, as is the case with the atmosphere moving and revolving with
the planet, but it is an absolute impossibility for Maxwell's equations
relating to moving magnetic bodies to be carried to their logical
c