(23) We now pass on to compound bodies.
[13:24] Definition.- When any given bodies of the same or different
magnitude are compelled by other bodies to remain in contact, or if they
be moved at the same or different rates of speed, so that their mutual
movements should preserve among themselves a certain fixed relation, we say
that such bodies are in union, and that together they compose one body or
individual, which is distinguished from other bodies by this fact of union.
[AXIOMS]
[A.X] In proportion as the parts of an individual, or a compound
body, are in contact over a greater or less superficies
moved from their position; consequently the individual will,
with greater or less difficulty, be brought to assume
another form. Those bodies, whose parts are in contact over
large superficies, are called hard; those, whose parts are
in contact over small superficies, are called soft; those,
whose parts are in motion among one another, are called fluid.
[LEMMAS]
[L.IV] If from a body or individual, compounded of several bodies,
be separated, and if, at the same time, an equal number of
other bodies of the same nature take their place, the
individual will preserve its nature as before, without
any change in its actuality (forma).
Proof.- Bodies ([L.i] ) are not distinguished in respect of
substance: that which constitutes the actuality (formam) of an
individual consists (by the last Def.
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