This duration will be the whole of nature which is the terminus posited by sense-awareness.

Thus the character of the percipient event determines the time-system immediately evident in nature.

As the character of the percipient event changes with the passage of nature--or, in other words, as the percipient mind in its passage correlates itself with the passage of the percipient event into another percipient event--the time-system correlated with the percipience of that mind may change.

When the bulk of the events perceived are cogredient in a duration other than that of the percipient event, the percipience may include a double consciousness of cogredience, namely the consciousness of the whole within which the observer in the train is 'here,' and the consciousness of the whole within which the trees and bridges and telegraph posts are definitely 'there.' Thus in perceptions under certain circumstances the events discriminated assert their own relations of cogredience.

This assertion of cogredience is peculiarly evident when the duration to which the perceived event is cogredient is the same as the duration which is the present whole of nature--in other words, when the event and the percipient event are both cogredient to the same duration.
We are now prepared to consider the meaning of stations in a duration, where stations are a peculiar kind of routes, which define absolute position in the associated timeless space.
There are however some preliminary explanations.