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The perceptive powers presuppose the vegetative, the rational presuppose the perceptive and imaginative: but how the one leads to the other is a question on which Aristotle tells us little. And how-a defect which Zeller has especially emphasized—how does this congeries of faculties resolve itself into a personal self, an individual me? We need perhaps hardly be astonished that Aristotle does not directly answer this question. Ideas develope themselves but slowly in the history of thought: and the conception of a personal, isolated and yet universal, self had not been grasped by the philosophers of antiquity. Reason is no doubt, as we have seen, said to be this self: but Reason as conceived by Aristotle seems, as destitute of any memory of the past and as unaffected by the experiences of life, to be without that attribute of consciousness which would seem necessary to the conception of self. Such criticism is perhaps of somewhat doctrinaire a type, since what applies to reason as creative is true as we have seen only of a phase of reason, and does not interfere with the exercise of consciousness in its application to phenomena. Yet it remains none the less true that Aristotle's theory of reason is full of difficulties which we indeed may try to solve but which are certainly not solved in Aristotle's own writings.
The number of these difficulties might casily be increased : and though, as we have seen, some of them are not so great as they at first sight appear, it is impossible to blind our eyes to the real nature of very many of them. But in place of pointing out defects, it is a pleasanter and perhaps more useful task to enumerate the really important truths which Aristotle's psychological treatise may be allowed to teach us. (1) To begin with, Aristotle was the first who constituted Psychology into a special science. He mapped out the phenomena of mind as the subject of a particular iotopla : and gave a definite turn to the humanitarian studies of Socrates by shewing that the knowledge of man involved particularly a knowledge of the nature of man's yuxń. But (2) while holding that psychology
was to be studied as an independent science, Aristotle further saw that the study of soul could not be successfully conducted so long as it was confined exclusively to the human manifestation of it. Man's yuxń in fact Aristotle found was simply one phase of that general tendency which nature at each stage of life displayed—a tendency to concentrate the specific functional activity of that stage in some definite form. And the law of such stages of life was, he found, one of regular subordination, so that the faculties of thought implied the possession of the faculties of sense and these again the faculties of nutrition. Thus (3) he called attention to the semi-physiological and corporeal character of some mental phenomena: he was especially struck by the material bodily side of the feelings: and he maintained that the body was not to be studied as an abstract entity but with particular reference to the bodily organization adapted to it. (4) He recognized and yet partially solved this
dualism in man's nature by his own definition of the puxń as V the implicit realization or truth of body. While unable fully
to explain the union of the antithesis he yet shewed that soul and body were not so much two contradictory forces as two complementary counterparts in human nature. But (5) he did not merely content himself with such an abstract explanation of man's yuxń ; he expanded and illustrated it by an enumeration of the different stages in the development of this soul from lower to higher forms; and by his explanation of the relation of these faculties to one another he advanced considerably beyond the standpoint of Plato. (6) He sketched with considerable success the object, organs and operations of the several senses : his analysis of sound and colour especially deserves notice for its anticipation of modern research. But (7) he also shewed the need of rising above sense in order to explain its intimations. His theory of a central or common sense, though mistaken in ascribing to sense what sense as such is unable to bestow—the distinction, comparison and interpretation of sensations—directs attention nevertheless to the presuppositions of every purely sensational system of cognition. And the unity of consciousness which he claims for the exercise of sense goes some way in explaining how the different faculties of soul become an indivisible personal self.
Still more is this brought out (8) in his theory of a creative reason as the presupposition of the v exercise of ordinary thought. For fragmentary though the theory is, it is nevertheless an emphatic assertion of the priority of thought to matter in the universe. How, Aristotle finds himself obliged to ask, does thought think things, how does an immaterial force come to receive and know material phenomena. And his answer is, as we have seen, that thought knows and thinks things only in so far as things are thought, so far as they are the work of reason, so that our subjective thought is but finding itself in outward things. Lastly, (9) Aristotle's theory of will forms a natural pendant to this same theory of reason. In place of the vague unsatisfactory conception of Ouós in Plato, we find the will conceived not as a single faculty but as the consilience of reason and feeling ; while at the same time Aristotle never loses sight of the fact that mere appetite as such does not lead to action, but requires to be constituted by thought as a rational desire before it can
V issue in conduct.
Psychological research has made great progress since the days of Aristotle. He would have been surprised to find that the association of ideas which he noticed so casually had been constituted by some into a universal key to the whole mental furniture of man, or that the higher mental processes no less than the lower had been resolved into the answer to an external stimulus-into that same conception of suffering' and imprintreceiving which he himself regarded as applicable to all but the highest exercise of thought. No true student of his writings will seek to discover these or other modern developments in his writings. But in his conception of the relation of soul and body, in his theory of a central sense and his intuitions of a creative reason, he left behind him lessons which no psychologist can afford to disregard.
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