But it is necessary that every thing which is changed, should be divisible: for since all mutation is from something to something; and when a thing is in that into which it is changed, it is no longer changed; but when it is in that from which it is changed, both itself and its parts are not yet changed; (for that which subsists similarly, is neither itself changed, nor its parts), — this being the case, it is necessary that one part of that which is changed should be in this, but another part in the other: for neither is it possible that the whole can be in both, nor in neither. But I mean in that into which it is changed, viz. that which is first according to mutation; as for instance, the dark brown from the white, and not the black: for it is not necessary that what is changed should be in either of the extremes. It is evident, therefore, that every thing which is changed will be divisible.
