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THREE:Another term occupying a very large place in Aristotle��s philosophy was well adapted to mediate between and eventually to unite the two speculative extremes. This was Substance; in logic the subject of predication, in metaphysics the substratum of qualities, the ο?σ?α or Being of the Ten Categories. Now First Matter might fairly claim the position of a universal subject or substance, since it was invested with every sensible quality in turn, and even, as the common element of all Forms, with every thinkable quality as well. Aristotle himself had finally pronounced for the individual compound of Form and Matter as the true substance. Yet he also speaks as if the essential definition of a thing constituted the thing itself; in which case Form alone could be the true subject; and a similar claim might be put forward on behalf of the Plotinian One.561Still more important than these observations themselves is the great truth he derives from them��since rediscovered and worked out in detail by Von Baer��that in the development of each individual the generic characters make their appearance before the specific characters.211 Nor is this a mere accidental or isolated remark, but, as we shall show in the next chapter, intimately connected with one of the philosopher��s metaphysical theories. Although not an evolutionist, he has made other contributions to biology, the importance of which has been first realised in the light of the evolution theory. Thus he notices the antagonism between individuation and reproduction;212 the connexion of increased size with increased vitality;213 the connexion of greater mobility,214 and of greater intelligence,215 with increased complexity of structure; the physiological division of labour in the higher animals;216 the formation of heterogeneous organs out of homogeneous tissues;217 the tendency towards greater centralisation in the higher organisms218��a remark connected with his two great anatomical discoveries, the central position of the heart in the vascular system, and the possession of a backbone by all red-blooded animals;219 the resemblance of animal intelligence to a rudimentary human intelligence, especially as manifested in children;220 and, finally, he attempts to trace a continuous series of gradations connecting the inorganic with the organic world, plants with animals, and the lower animals with man.221

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