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Whitehead's Two Kinds of Process
1. The fluency of subjective immediacy in the real internal constitution of an actual entity (concrescence)
2. The transition from particular existent to particular existent, moment by moment (transition)
At this point the group of seventeenth- and eighteenth century philosophers practically made a discovery, which, although it lies on the surface of their writings, they only half-realized. The discovery is that there are two kinds of fluency. One kind is the concrescence† which, in Locke's language, is ‘the real internal constitution of a particular existent.’ The other kind is the transition from particular existent to particular existent. This transition, again in Locke's language, is the ‘perpetually perishing’ which is one aspect of the notion of time; and in another aspect the transition is the origination of the present in conformity with the ‘power’ of the past. The phrase ‘the real internal constitution of a particular existent,’ the description of the human understanding as a process of reflection upon data, the phrase ‘perpetually perishing,’ and the word ‘power’ together with its elucidation are all to be found in Locke's Essay. Yet owing to the limited scope of his investigation Locke did not generalize or put his scattered ideas together. This implicit notion of the two kinds of flux finds further unconscious illustration in Hume. It is all but explicit in Kant, though— as I think— misdescribed. Finally, it is lost in the evolutionary monism of Hegel and of his derivative schools. With all his inconsistencies, Locke is the philosopher to whom it is most useful to recur, when we desire to make explicit the discovery of the two kinds of fluency, required for the description of the fluent world. One kind is the fluency inherent in the constitution of the particular existent. This kind I have called ‘concrescence.’ The other kind is the fluency whereby the perishing of the process, on the completion of the particular existent, constitutes that existent as an original element in the constitutions of other particular existents elicited by repetitions of process. This kind I have called ‘transition.’ Concrescence moves towards its final cause, which is its subjective aim; transition is the vehicle of the efficient cause, which is the immortal past.
Whitehead, Alfred North. Process and Reality (Gifford Lectures Delivered in the University of Edinburgh During the Session 1927-28) (p. 210). Free Press. Kindle Edition.
Whitehead, Alfred North. Process and Reality (Gifford Lectures Delivered in the University of Edinburgh During the Session 1927-28) (p. 210). Free Press. Kindle Edition.