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TWO:The ambiguities and uncertainties which Plotinus exhibits in theorising on the origin of Matter, are due not only to the conflicting influences of Plato and Aristotle, but also to another influence quite distinct from theirs. This is the Stoic cosmology. While utterly repudiating the materialism of the Stoics, Plotinus evidently felt attracted by their severe monism, and by the consistent manner in which they derived every form of existence from the divine substance. They too recognised a distinction between Form and Matter, the active and the passive principle in Nature, but they supposed that the one, besides being penetrated and moulded by the other, had also been originally produced by it. Such a theory was well suited to the energetic and practical character of Stoic morality, with its aversion from mere contemplation, its immediate bearing on the concrete interests of life. Man was conceived as an intelligent force, having for his proper function to bring order out of chaos, ��to make reason and the will of God prevail,�� and this ideal appeared to be reflected in the dynamic constitution of Nature. With Plotinus, on the other hand, as with Aristotle, theory and not practice was the end of life, or rather, as he himself expressed it, practice was an inferior kind of theorising, an endeavour to set before oneself in outward form what should properly be sought in the noetic world where subject and object are one.490 Accordingly, while accepting the Stoic monism, he strove to bring it into close agreement with Aristotle��s cosmology, by substituting contemplation for will as the creative principle in all existence, no less than as the ideal of happiness for man.It might have been expected that, on reaching physiology, the Stagirite would stand on firmer ground than any of his contemporaries. Such, however, is not the case. As already observed, his achievements belong entirely to the dominion of anatomy and descriptive zoology. The whole internal economy of the animal body is, according to him, designed for the purpose of creating and moderating the vital heat;315 and in apportioning their functions to the different organs he is entirely dominated by this fundamental error. It was a common notion among the Greeks, suggested by sufficiently obvious considerations, that the brain is the seat of the psychic activities. These, however, Aristotle transports to the heart, which, in his system, not only propels the blood through the body, but is also the source of heat, the common centre where the different special sensations meet to be compared, and the organ of imagination and of passion. The sole function of the brain is to cool down the blood��a purpose which the lungs also subserve. Some persons believe that air is a kind of food, and is inhaled in order to feed the internal fire; but their theory would involve the absurd consequence that all animals breathe, for all have some heat. Anaxagoras and Diogenes did, indeed, make that assertion, and the latter even went so far as to say that fish breathe with their gills, absorbing the air held in solution by the water passed through them��a misapprehension, says Aristotle, which arose from not having studied the final cause of respiration.201 His physiological theory of generation is equally unfortunate. In accordance with his metaphysical system, hereafter to be explained, he distinguishes two elements in the reproductive process, of which one, that contributed by the male, is exclusively formative; and the other, that contributed by the female, exclusively material. The prevalent opinion was evidently, what we know now to be true, that each parent has both a formative and a material share in the composition of the embryo. Again, Aristotle, strangely enough, regards the generative element in both sexes as an unappropriated portion of the animal��s nutriment, the last and most refined product of digestion, and therefore not a portion of the parental system at all; while other biologists, anticipating Mr. Darwin��s theory of pangenesis in a very wonderful manner, taught that the semen is a con316flux of molecules derived from every part of the body, and thus strove to account for the hereditary transmission of individual peculiarities to offspring.202

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