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. Things, then, that are continuous
in any way called one, even if they admit of being bent, and still
more those which cannot be bent; e.g. the shin or the thigh is more
one than the leg, because the movement of the leg need not be one. And
the straight line is more one than the bent; but that which is bent
and has an angle we call both one and not one, because its movement
may be either simultaneous or not simultaneous; but that of the
straight line is always simultaneous, and no part of it which has
magnitude rests while another moves, as in the bent line.
(b)(i) Things are called one in another sense because their
substratum does not differ in kind; it does not differ in the case
of things whose kind is indivisible to sense. The substratum meant
is either the nearest to, or the farthest from, the final state.
For, one the one hand, wine is said to be one and water is said to
be one, qua indivisible in kind; and, on the other hand, all juices,
e.g. oil and wine, are said to be one, and so are all things that
can be melted, because the ultimate substratum of all is the same; for
all of these are water or air.
(ii) Those things also are called one whose genus is one though
distinguished by opposite differentiae-these too are all called one
because the genus which underlies the differentiae is one (e.g. horse,
man, and dog form a unity, because all are animals), and indeed in a
way similar to that in which the matter is one
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