They are completely signified for events whose physical characters are unknown.

Thus the spatio-temporal measurements are independent of the objectival physical characters.

Furthermore the character of our knowledge of a whole duration, which is essentially derived from the significance of the part within the immediate field of discrimination, constructs it for us as a uniform whole independent, so far as its extension is concerned, of the unobserved characters of remote events.

Namely, there is a definite whole of nature, simultaneously now present, whatever may be the character of its remote events.

This consideration reinforces the previous conclusion.