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As I said then, they differ in kind, and you cannot at any time

you choose find a Movement complete in its whole nature, but, if

at all, in the whole time requisite.

And so it is with the Movement of walking and all others: for, if

motion be a Movement from one place to another place, then of it

too there are different kinds, flying, walking, leaping, and

such-like. And not only so, but there are different kinds even in

walking: the where-from and where-to are not the same in the

whole Course as in a portion of it; nor in one portion as in

another; nor is crossing this line the same as crossing that:

because a man is not merely crossing a line but a line in a given

place, and this is in a different place from that.

Of Movement I have discoursed exactly in another treatise. I will

now therefore only say that it seems not to be complete at any

given moment; and that most movements are incomplete and

specifically different, since the whence and whither constitute

different species.