Each moment is a group of abstractive sets, and the events which are members of these sets are all members of one family of durations.

The moments of one family form a temporal series; and, allowing the existence of different families of moments, there will be alternative temporal series in nature.

Thus the method of extensive abstraction explains the origin of temporal series in terms of the immediate facts of experience and at the same time allows for the existence of the alternative temporal series which are demanded by the modern theory of electromagnetic relativity.
We now turn to space.

The first thing to do is to get hold of the class of abstractive elements which are in some sense the points of space.
Such an abstractive element must in some sense exhibit a convergence to an absolute minimum of intrinsic character.

Euclid has expressed for all time the general idea of a point, as being without parts and without magnitude.