Both Aristotle and Reid include in their meaning of Time, not merely succession, but duration or continuity. Mr. James Mill includes only succession—antecedents and consequents. He thinks that continuity is nothing else than an illusion or prejudice, arising from extreme rapidity of succession (pp. [123]—125).
“Time and Space (says Harris, cited [p. 124]) have this in common, that they are both of them by nature continuous. But in this they differ—that all the parts of space exist at once and together; while those of Time only exist in Transition or Succession.” Mr. James Mill proceeds to say—”This is only transcribing the common language. What remained was, to show what are the real facts couched under this language.”
Undoubtedly these facts ought to be shewn, and shewn fully. But I cannot think that they are shewn fully in the 136 present Chapter of the Analysis. On the contrary, a most important part of the case is omitted—Duration or Continuity—which Aristotle has put in the front of his exposition, and after him Reid as well as Harris.
If it were true that the word Time is the abstract, having for its concrete succeeding objects and nothing more, we should not need the term at all. The abstract term “Succession” already answers this purpose, much more perspicuously and obviously. But Time includes something more than succession. It comprehends not merely potentiality for succeeding objects or events, but also potentiality for continuous motions or sensations: it embraces duration as well as succession.
The exposition of Aristotle is adapted to readers and debates so different from those of the present day, that it often appears strange, and even mystical, when ever so well translated. In the present case, however, we derive satisfaction from knowing, that his doctrine is, with a very small reserve, adopted by Hobbes, the most anti-mystical of all philosophers. (Hobbes’ First Grounds of Philosophy—Part II., Sect. 7. 3). Aristotle has given a theory of Time at great length, perfectly clear as to its main features, though in several of its details, obscure and difficult to follow. I will add that throughout nearly the whole exposition, he keeps the abstract in close implication with the concrete: the neglect of which precaution, by many philosophers, is so justly censured by the Author of the Analysis.
Aristotle, according to a practice frequent with him, begins by enumerating various puzzles and difficulties which stand in the way of any theory (διαπορῆσαι Physic. IV. 10. p. 217. 6. 30). In doing this, here as elsewhere, he states the difficulties in a manner somewhat paradoxical. The citation of [page 126], (together with [note], page 127,) are all taken from this preliminary excursion, the beginning and end of which Aristotle distinctly marks (Physica IV. c. 10. p. 217 b. 30. p. 218 a. 30). He then proceeds to exposition; and after remarking that Time is one and alike every where, amidst the greatest 137 diversity of events succeeding each other—he says that it is not indeed identical with Motion, (as some theorists considered it), but that it is nevertheless inseparable from Motion being one of the aspects or appurtenances of Motion. Magnitude or Body moved—Motion—Time—all go together in Aristotle’s conception. Magnitude is continuous: Motion is continuous: Time is continuous (Physica IV. 11. p. 219. a. 12. 223. a. 10): Line is continuous. On the other hand, the Point is separate and indivisible; no two Points have any common term: a Line is not made up of Points, but of smaller Lines; and every Line has Points for its bounds or limits. What the Point is to a Line, the Now or Instant is to Time: the Instant is not a portion of Time, but the boundary of each portion, and the conjoining boundary between Time past and Time future. (Physica IV. 11. p. 220. a. 5-25—VI. 3. 234. a. 1-24).
Aristotle defines Time as the Number of Motion according to Former and Later: i.e., Continuous Motion, considered as numerable and successive. To take the words of Harris, from Aristotle (cited [p. 128] of the Analysis)—“It is from contemplating two or more Instants under one view, together with that Interval of Continuity which subsists between them, that we acquire insensibly the Idea of Time.”—“Months and Years are all so many Intervals described as above; that is to say, passing Intervals of Continuity between two Instants viewed together.”
Mr. James Mill hardly does justice to this exposition, when he observes ([p. 131])—“Neither Harris nor Reid does anything more than merely state the fact, without an attempt to explain it. That we cannot have the idea of time, without the observation of succession; and that memory is joined with sense in the observation of successions,—is the matter of fact. What Time is, distinct from the memory and the sensations, they ought to have told us, but have not.”—In this passage, the word “sensations” is evidently used by Mr. James Mill as equivalent to “successions” or successive 138 sensations: and the observation appears to me not well founded. I think that Aristotle has told us, and Harris after him, what Time is, distinct from the successive sensations. It includes Motion and the Continuity of Motion. These are elements of which Mr. James Mill takes no notice: and they supply the deficiency of which he complains.
It is one of the many merits of Mr. James Mill’s Analysis that he has paid more attention to movements and muscular sensibility, as elements of our consciousness, than philosophers had done before him. But in this chapter unfortunately, he has left them out, and has confined himself to successions. The explanation of Time, given in the main by Aristotle, is completed and elucidated by Professor Bain in his work on the Senses and the Intellect (chapter on the Muscular Feelings, sect. 20—23, pp. 95, 96; compare also p. 183, in ed. 3rd). The feeling of continuance in our muscular exertions, of longer or shorter duration in the sweep of our limbs, is one of the primordial varieties of sensibility. A longer expenditure of our energy affects the consciousness differently from a shorter. In a full sweep of the arm, we are conscious of the instant of commencement as antecedent,—the interval of continued effort,—and the instant of termination as following. This is the clearest illustration of that which Aristotle and Harris describe as Time: two instants former and later, with continuous interval between them. Motion is the most striking and obvious example of Continuity, and is therefore employed by Aristotle as the basis for his exposition of Time. The eternal and uniform motions of the celestial bodies were to him the most impressive of all phenomena; the great standard by which all other motions were to be measured. Hobbes also takes the Line as the proper exponent of time. But though motion affords the best and amplest illustrations of Continuity, it is not motion only that is felt as continuous. The sense of continuance is felt in regard to other impressions also. Professor Bain observes—”All impressions made on the mind, whether those of muscular energy, or those of the ordinary senses, are felt differently according as they endure 139 for a longer or a shorter time. This is true of the higher emotions also. The continuance of a mental state must be discriminated by us from the very dawn of consciousness; and hence our estimate of time is one of our earliest mental aptitudes. It attaches to every feeling that we possess”—(p. 93).
We thus perceive that the sense of continuance is just as much an original presentation to our consciousness, as the sense of succession. This is an important fact, which has not been sufficiently adverted to in the exposition of complex ideas such as Time and Space. The fundamentum of Continual Quantity is an immediate manifestation of our sensitive discriminations not less than that of Discrete Quantity. The complex Idea of Time embodies both.[a] Mr. James Mill insists everywhere, with laudable emphasis, upon the necessity of seeking the meaning of every abstract term in the concrete particulars out of which it grows. But in explaining Time, he has not set before himself all the concrete particulars in their full variety and amplitude. Confining himself to Succession, and scarcely touching Continuance, he has not been led to follow out the facts of motion in all their diversified aspects, nor the many abstractions and generalisations which 140 spring from comparison of motions with each other, under some one of these aspects.