of repulsion with which they impede one another, and
when it issues in lateral movements which are capable
by means of the centrifugal force of encompassing the
central body in an orbit, then there are produced
whirls or vortices of particles, each of which by itself
describes a curved line by the composition of the
attracting force and the force of revolution that had been
bent sideways. These kinds of orbits all intersect
one another, for which their great dispersion in this
space gives place. Yet these movements are in many
ways in conflict with one another, and they naturally
tend to bring one another to a uniformity--that is,
into a state in which one movement is as little
obstructive to the other as possible. This happens in
two ways: first by the particles limiting one another's
movement till they all advance in one direction; and,
secondly, in this way, that the particles limit their
vertical movements in virtue of which they are
approaching the centre of attraction, till they all move
horizontally--i. e., in parallel circles round the sun as
their centre, no longer intercept one another, and by
the centrifugal force becoming equal with the falling
force they keep themselves constantly in free circular
orbits at the distance at which they move. The result,
finally, is that only those particles continue to move in
this region of space which have acquired by their fall
a velocity, and through the resistance of the other particles
a direction, by which they can continue to maintain
a FREE CIRCULAR MOVEMENT....