as to
necessitate a separate Impulse being given to every separate star, or
sun, as each one is created or formed during the progress and
development of the universe of worlds.

I would much rather believe that which I hold to be the correct
explanation, viz. that He has given to a certain fundamental and
primordial medium, certain qualities and properties, by, and through
which are originated and perpetuated, all the motions of the heavenly
bodies already existent in the universe, or that are ever likely to be
existent throughout all time.

The question of separate Primitive Impulses for separate bodies becomes
more and more incongruous and inadmissible, as we consider it in its
application to such small bodies as meteors and planetoids. Is it not
contrary to our fundamental principles of Philosophy, that a separate
Impulse should be necessary for all small bodies that exist in their
myriads throughout the solar system, not to speak of the universe of
which that system forms a part? Such a conception as Primitive Impulse,
to each separate world, is altogether opposed to one's idea of that
simplicity and beauty which govern the universe at large, and violates
the first rule of our philosophical reasoning, and for this reason must
be rejected from the System of Philosophy to be propounded in this work.

ART. 10. _Centripetal Force._--Let us now look at the Centripetal Force,
and ask ourselves what is meant by such a force, and what is its mode of
action and working. Centripetal Force, strictly, may be defined as that
force which is always exerted towards the centre of the attracting body.

Taking the earth as an example, Newton points out, that though the
gravity of bodies arises from their gravitation towards several parts of
the earth; yet, because this power acts always towards the centre of
gravity of the earth, it is therefore called the Centripetal Force.

This force, then, is that part of the Law of Gravitation which
corresponds to the Attraction of Gravitation, and is always exerted in
that straight line from the body attracted, to the centre of the
attracting body, which joins the centres of gravity of the two bodies
concerned.

The combination and effect of the various forces included in the Law of
Gravitation are illustrated by the familiar illustration of the ball
whirled round the hand by a piece of string, or the bucket filled with
water, whirled round in the same way. Let us take the former. A pie