In other words there is a passage of sense-awareness and a passage of thought.

Thus the reign of the quality of passage extends beyond nature.

But now the distinction arises between passage which is fundamental and the temporal series which is a logical abstraction representing some of the properties of nature.

A temporal series, as we have defined it, represents merely certain properties of a family of durations--properties indeed which durations only possess because of their partaking of the character of passage, but on the other hand properties which only durations do possess.

Accordingly time in the sense of a measurable temporal series is a character of nature only, and does not extend to the processes of thought and of sense-awareness except by a correlation of these processes with the temporal series implicated in their procedures.
So far the passage of nature has been considered in connexion with the passage of durations; and in this connexion it is peculiarly associated with temporal series.