THREE:The methodical distinction between the materials for generalisation and generalisation itself, is derived from the metaphysical distinction between Matter and Form in Nature.539 This distinction is the next great feature of Bacons philosophy, and it is taken, still more obviously than the first, from Aristotle, the most manifest blots of the original being faithfully reproduced in the copy. The Forms375 of simple substances were, according to the Stagirite, their sensible qualities. The Forms of aggregates were the whole complex of their differential characteristics. And although the formal cause or idea of a thing was carefully discriminated from its efficient and final causes, it was found impossible, in practice, to keep the three from running into one. Again, the distinction between single concepts and the judgments created by putting two concepts together, although clearly conveyed by the logical distinction between terms and propositions, was no sooner perceived than lost sight of, thanks to the unfortunate theory of essential predication. For it was thought that the import of universal propositions consisted either in stating the total concept to which a given mark belonged, or in annexing a new mark to a given concept. Hence, in Aristotles system, the study of natural law means nothing but the definition and classification of natural types; and, in harmony with this idea, the whole universe is conceived as an arrangement of concentric spheres, each receiving its impulse from that immediately above it. Precisely the same confusion of Form, Cause, and Law reigns throughout Bacons theory of Nature. We do, indeed, find mention made of axiomata or general propositions to a greater extent than in the Organon, but they are never clearly distinguished from Forms, nor Forms from functions.540 And although efficient and material causes are assigned to physics, while formal and final causes are reserved for metaphysicsan apparent recognition of the wide difference between the forces which bring a thing into existence and the actual conditions of its stability,this arrangement is a departure from the letter rather than from the spirit of Aristotles philosophy. For the efficient causes of the De376 Augmentis answer roughly to the various kinds of motion discussed in the Physics and in the treatise On Generation and Corruption; while its Forms are, as we have seen, identified with natural causes or laws in the most general sense.
FORE:In saying that the post-Aristotelian philosophers were not original thinkers, we must guard against the supposition that they contributed nothing of value to thought. On the contrary, while not putting forward any new theories, they generalised some of the principles borrowed from their predecessors, worked out others in minute detail, and stated the arguments on both sides of every controverted point with superior dialectic precision. Thus, while materialism had been assumed as self-evidently true by the pre-Socratic schools, it was maintained by the Stoics and Epicureans on what seemed to be grounds of experience and reason. And, similarly, we find that Plotinus, having arrived at the consciousness that spiritualism is the common ground on which294 Plato and Aristotle stand, the connecting trait which most completely distinguishes them from their successors, proceeds in his second essay436 to argue the case against materialism more powerfully than it had ever been argued before, and with nearly as much effect as it has ever been argued since.At the same time Lucretius is resolved that no false analogy shall obscure the distinction between life and the conditions of life. It is for attempting, as he supposes, to efface this distinction that he so sharply criticises the earlier Greek thinkers. He scoffs at Heracleitus for imagining that all forms of existence can be deduced from the single element of fire. The idea of evolution and transformation seems, under some of its aspects, utterly alien to our poet. His intimacy with the world of living forms had accustomed him to view Nature as a vast assemblage of fixed types which might be broken up and reconstructed, but which by no possibility could pass into one another. Yet this rigid retention of characteristic differences in form permits a certain play and variety of movement, an individual spontaneity for which no law can be prescribed. The foedera Naturai, as Prof. Sellar aptly observes, are opposed to the foedera fati.206 And109 this is just what might be expected from a philosophy based on the contemplation of life. For, while there is no capriciousness at all about the structure of animals, there is apparently a great deal of capriciousness about their actions. On the other hand, the Stoics, who derived their physics in great part from Heracleitus, came nearer than Lucretius to the standpoint of modern science. With them, as with the most advanced thinkers now, it is the foedera Naturaithe uniformities of co-existencewhich are liable to exception and modification, while the foedera fatithe laws of causationare necessary and absolute.
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