THREE:45His analysis of individuality was the first step in this direction. We have seen that he treats definition as a process of gradual specification, beginning with the most general notions, and working down by successive differentiations to the most particular. Now, the completed conception is itself the integration of all these differences, the bond of union holding them together. Turning to an antithetical order of ideas, to the material substance of which bodies are composed, and its various transformations, we find him working out the same vein of thought. According to the Aristotelian chemistry, an ultimate indeterminate unknowable something clothes itself with one or other of the opposing attributes, dry and moist, hot and cold; and when two of these are combined, manifests itself to our senses as one of the four elements. The elements combine in a particular manner to form homogeneous animal tissues, and these again are united into heterogeneous organs, which together constitute the living body. Here, then, we have two analogous series of specificationsone conceptual and leading down from the abstract to the concrete, the other physical, and leading up from the vague, the simple, and the homogeneous, to the definite, the complex, and the heterogeneous. Aristotle embraces both processes under a single comprehensive generalisation. He describes each of them as the continuous conversion of a346 possibility into an actuality. For the sake of greater clearness, let us take the liberty of substituting modern scientific terms for his cumbrous and obsolete classifications. We shall then say that the general notion, living thing, contains under it the two less general notionsplant and animal. If we only know of any given object that it has life, there is implied the possibility of its being either the one or the other, but not both together. On determining it to be (say) an animal, we actualise one of the possibilities. But the actualisation is only relative, and immediately becomes the possibility of being either a vertebrate or an invertebrate animal. The actuality vertebrate becomes the possibility of viviparous or oviparous, and so on through successive differentiations until we come (say) to a man. Now let us begin at the material end. Here are a mass of molecules, which, in their actual state are only carbon, nitrogen, and so forth. But they are potential starch, gluten, water, or any other article of food that might be named; for under favourable conditions they will combine to form it. Once actualised as such, they are possible blood-cells; these are possible tissues; these, again, possible organs, and lastly we come to the consensus of vital functions, which is a man. What the raw material is to the finished product, that are the parts to the entire organism, the elements to the compound, the genus to the species, and such in its very widest sense is potency to realisation, δ?ναμι? to ?ντελ?χεια, throughout the universe of growth and decay.246
FORE:But while philosophers cannot prescribe a method to physical science, they may, to a certain extent, bring it under their cognisance, by disengaging its fundamental conceptions and assumptions, and showing that they are functions of mind; by arranging the special sciences in systematic order for purposes of study; and by investigating the law of their historical evolution. Furthermore, since psychology is the central science of philosophy, and since it is closely connected with physiology, which in turn reposes on the inorganic152 sciences, a certain knowledge of the objective world is indispensable to any knowledge of ourselves. Lastly, since the subjective sphere not only rests, once for all, on the objective, but is also in a continual state of action and reaction with it, no philosophy can be complete which does not take into account the constitution of things as they exist independently of ourselves, in order to ascertain how far they are unalterable, and how far they may be modified to our advantage. We see, then, that Socrates, in restricting philosophy to human interests, was guided by a just tact; that in creating the method of dialectic abstraction, he created an instrument adequate to this investigation, but to this alone; and, finally, that human interests, understood in the largest sense, embrace a number of subsidiary studies which either did not exist when he taught, or which the inevitable superstitions of his age would not allow him to pursue.
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