is vaporised aetherial matter is thrown off in layers which are
partly spherical in form, the layers always being expelled in the first
instance _towards_ the sun, on account of that centrifugal motion which
has its birth in the nucleus of the comet.

This explanation fully establishes and confirms the first and second
Reflections of Herschel as given in Art. 114, and, moreover, is itself
established by the very phenomena which comets present in their approach
to the sun. As soon, however, as the vaporised matter is expelled from
the nucleus towards the sun, it is met by the centrifugal motion of the
electro-magnetic Aether which proceeds _from the sun_, and this pressure
of the aetherial waves on the advancing comet acts as a repelling power,
literally repelling the vaporised matter from the sun, and thus giving
rise to the existence of its tail.

This explanation fully confirms the third Reflection of Herschel
referred to in Art. 114, and is itself also confirmed by actual
observation. During all this time, however, the comet has been
approaching the sun with a decreased velocity, for its velocity has been
minimised by the resistance it has had to overcome in its approach to
the sun. As soon, however, as it reaches the sun, it is whirled round
that body by the rotating Aether medium, as the intensity of its
rotation is greatest nearest the sun, with a velocity which often
exceeds thousands of miles per hour.

Having passed its perihelion, in view of the physical existence of our
centrifugal motion, let us now ask ourselves what ought to happen to the
comet? Previous to its perihelion, the comet's motion and the
centrifugal motion due to the pressure of the Aether were in opposition,
but after passing the perihelion, the comet's motion and the centrifugal
motion will be acting conjointly, with the result that the motion of the
comet would be accelerated. Now this is exactly what observation teaches
us does happen in regard to comets, when they have passed their
perihelion passage.

As Herschel pointed out with reference to the comet of 1680 (Art. 114),
it took 28 days to fall to the sun, but only took four days to cover the
_same_ distance, after it had passed the sun and rounded the perihelion.
So that we have here, as Herschel stated, an irrefutable evidence of the
existence of the repulsive power whose existence we have demonstrated.

Again, there is another fact which has to be taken into consideration in
rega