CHAPTER V.
MOTION AND CHANGE AND ITS PERCEPTION.
I am sensible that this chapter will repeat much of the former discussion. It is not for my own pleasure that I write it, but as an attempt to strengthen the reader. Whoever is convinced that change is a self-contradictory appearance, will do well perhaps to pass on towards something which interests him.
Motion has from an early time been criticised severely, and it has never been defended with much success. I will briefly point to the principle on which these criticisms are founded. Motion implies that what is moved is in two places in one time; and this seems not possible. That motion implies two places is obvious; that these places are successive is no less obvious. But, on the other hand, it is clear that the process must have unity. The thing moved must be one; and, again, the time must be one. If the time were only many times, out of relation, and not parts of a single temporal whole, then no motion would be found. But if the time is one, then, as we have seen, it cannot also be many.
A common “explanation” is to divide both the space and the time into discrete corresponding units, taken literally ad libitum. The lapse in this case is supposed to fall somehow between them. But, as a theoretical solution, the device is childish. Greater velocity would in this case be quite impossible; and a lapse, falling between timeless units, has really, as we have seen, no meaning. And where the unity of these lapses, which makes the
