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 now made use of in science, which on this ground invite metaphysical correction, and on which it might here be instructive to dwell. But for want of competence and want of space, and, more than all perhaps from the fear of being misunderstood, I think it better to pass on. There are further questions about Nature more important by far for our general enquiry.

Is the extended world one, and, if so, in what sense? We discussed, in Chapter xviii., the unity of time, and it is needful to recall the conclusion we reached. We agreed that all times have a unity in the Absolute, but, when we asked if that unity itself must be temporal, our answer was negative. We found that the many time-series are not related in time. They do not make parts of one series and whole of succession; but, on the contrary, their interrelation and unity falls outside of time. And, in the case of extension, the like considerations produce a like result. The physical world is not one in the sense of possessing a physical unity. There may be any number of material worlds, not related in space, and by consequence not exclusive of, and repellent to, each other.

It appears, at first, as if all the extended was part of one space. For all spaces, and, if so, all material objects, seem spatially related. And such an interrelation would, of course, make them members in one extended whole. But this belief, when we reflect, begins instantly to vanish. Nature in my dreams (for example) possesses extension, and yet spatially it is not one with my physical world. And in imagination and in thought we have countless existences, material and extended, which stand in no spatial connection with each other or with the world which I perceive. And it is idle to reply that these bodies and their arrangements are unreal, unless we are sure of the sense which we give to reality. For