xistence without
the mind; and that they are ordinarily conceived with relation to
sensible things, to which nevertheless in their own nature they bear no
relation at all.
111. As for Time, as it is there taken in an absolute or abstracted
sense, for the duration or perseverance of the existence of things, I
have nothing more to add concerning it after what has been already said
on that subject. Sect. 97 and 98. For the rest, this celebrated author
holds there is an absolute Space, which, being unperceivable to sense,
remains in itself similar and immovable; and relative space to be the
measure thereof, which, being movable and defined by its situation in
respect of sensible bodies, is vulgarly taken for immovable space. Place
he defines to be that part of space which is occupied by any body; and
according as the space is absolute or relative so also is the place.
Absolute Motion is said to be the translation of a body from absolute
place to absolute place, as relative motion is from one relative place to
another. And, because the parts of absolute space do not fall under our
senses, instead of them we are obliged to use their sensible measures,
and so define both place and motion with respect to bodies which we
regard as immovable. But, it is said in philosophical matters we must
abstract from our senses, since it may be that none of those bodies which
seem to be quiescent are truly so, and the same thing which is moved
relatively may be really at rest; as likewise one and the same body may
be in relative rest and motion, or even moved with contrary relative
motions at the same time, according as its place is variously defined.
All which ambiguity is to be found in the apparent motions, but not at
all in the true or absolute, which should therefore be alone regarded in
philosophy. And the true as we are told are distinguished from apparent
or relative motions by the following properties.--First, in true or
absolute motion all parts which preserve the same position with respect
of the whole, partake of the motions of the whole. Secondly, the place
being moved, that which is placed therein is also moved; so that a body
moving in a place which is in motion doth participate the motion of its
place. Thirdly, true motion is never generated or changed otherwise than
by force impressed on the body itself. Fourthly, true motion is always
changed by force impressed on the body moved. Fifthly, in circular motion
barely relative
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