g. if one says that man is the same as 'musical
man'; for this is either because 'musical' is an accident of man,
which is one substance, or because both are accidents of some
individual, e.g. Coriscus. Both, however, do not belong to him in
the same way, but one presumably as genus and included in his
substance, the other as a state or affection of the substance.
The things, then, that are called one in virtue of an accident,
are called so in this way. (2) Of things that are called one in virtue
of their own nature some (a) are so called because they are
continuous, e.g. a bundle is made one by a band, and pieces of wood
are made one by glue; and a line, even if it is bent, is called one if
it is continuous, as each part of the body is, e.g. the leg or the
arm. Of these themselves, the continuous by nature are more one than
the continuous by art. A thing is called continuous which has by its
own nature one movement and cannot have any other; and the movement is
one when it is indivisible, and it is indivisible in respect of
time. Those things are continuous by their own nature which are one
not merely by contact; for if you put pieces of wood touching one
another, you will not say these are one piece of wood or one body or
one continuum of any other sort. 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.
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