This procedure has led us to an investigation of the characters of space and time.

It results from these investigations that the formulae of the third case and the orthodox formulae are on a level as possible formulae resulting from the basic character of our knowledge of nature.

The orthodox formulae have thus lost any advantage as to necessity which they enjoyed over the serial group.

The way is thus open to adopt whichever of the two groups best accords with observation.
I take this opportunity of pausing for a moment from the course of my argument, and of reflecting on the general character which my doctrine ascribes to some familiar concepts of science.

I have no doubt that some of you have felt that in certain aspects this character is very paradoxical.
This vein of paradox is partly due to the fact that educated language has been made to conform to the prevalent orthodox theory.