Unless we do so, our science, which employs the concept of instantaneous nature, must abandon all claim to be founded upon observation.
I will use the term 'moment' to mean 'all nature at an instant.' A moment, in the sense in which the term is here used, has no temporal extension, and is in this respect to be contrasted with a duration which has such extension.

What is directly yielded to our knowledge by sense-awareness is a duration.

Accordingly we have now to explain how moments are derived from durations, and also to explain the purpose served by their introduction.
A moment is a limit to which we approach as we confine attention to durations of minimum extension.

Natural relations among the ingredients of a duration gain in complexity as we consider durations of increasing temporal extension.

Accordingly there is an approach to ideal simplicity as we approach an ideal diminution of extension.
The word 'limit' has a precise signification in the logic of number and even in the logic of non-numerical one-dimensional series.