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Before entering on our task of reconstruction, we must turn aside to consider with what success the same enterprise has been attempted by modern German criticism, especially by its chief contemporary representative, the last and most distinguished historian of Greek philosophy. The result at which Zeller, following Schleiermacher, arrives is that the great achievement of Socrates was to put forward an adequate idea of knowledge; in other words, to show what true science ought to be, and what, as yet, it had never been, with the addition of a demand that all action should be based on such a scientific knowledge as its only sure foundation.87 To know a thing was to know its essence, its concept, the assemblage of qualities which together constitute its definition, and make it to be what it is. Former thinkers had also sought for knowledge, but not as knowledge, not with a clear notion of what it was that they really wanted. Socrates, on the other hand, required that men should always be prepared to give a strict account of the end which they had in view, and of the means by which they hoped to gain it. Further, it had been customary to single out for exclusive attention that quality of an object by which the observer happened to be most strongly impressed, passing over all the others; the consequence of which was that the philosophers had taken a one-sided view of facts, with the result of falling into hopeless disagreement among themselves; the Sophists had turned these contradictory points of view against one another, and thus effected their mutual destruction; while the dissolution of objective certainty had led to a corresponding dissolution of moral truth. Socrates accepts the Sophistic scepticism so far as it applies to the existing state of science, but does not push it to the same fatal con118clusion; he grants that current beliefs should be thoroughly sifted and, if necessary, discarded, but only that more solid convictions may be substituted for them. Here a place is found for his method of self-examination, and for the self-conscious ignorance attributed to him by Plato. Comparing his notions on particular subjects with his idea of what knowledge in general ought to be, he finds that they do not satisfy it; he knows that he knows nothing. He then has recourse to other men who declare that they possess the knowledge of which he is in search, but their pretended certainty vanishes under the application of his dialectic test. This is the famous Socratic irony. Finally, he attempts to come at real knowledge, that is to say, the construction of definitions, by employing that inductive method with the invention of which he is credited by Aristotle. This method consists in bringing together a number of simple and familiar examples from common experience, generalising from them, and correcting the generalisations by comparison with negative instances. The reasons that led Socrates to restrict his enquiries to human interests are rather lightly passed over by Zeller; he seems at a loss how to reconcile the alleged reform of scientific method with the complete abandonment of those physical investigations which, we are told, had suffered so severely from being cultivated on a different system.

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The teleology of Aristotle requires a word of explanation, which may appropriately find its place in the present connexion. In speaking of a purpose in Nature, he does not mean that natural productions subserve an end lying outside themselves; as if, to use Goethe��s illustration, the bark of cork-trees was intended to be made into stoppers for ginger-beer bottles; but that in every perfect thing the parts are interdependent, and exist for the sake of the whole to which they belong. Nor does he, like so many theologians, both ancient and modern, argue from the evidence of design in Nature to the operation of a designing intelligence outside her. Not believing in any creation at all apart from works of art, he could not believe in a creative intelligence other than that of man. He does, indeed, constantly speak of Nature as if she were a personal providence, continually exerting herself for the good of her creatures. But, on looking a little closer, we find that the agency in question is completely unconscious, and may be identified with the constitution of each particular thing, or rather of the type to which it belongs. We have said that Aristotle��s intellect was essentially descriptive, and we have here another illustration of its characteristic quality.333 The teleology which he parades with so much pomp adds nothing to our knowledge of causes, implies nothing that a positivist need not readily accept. It is a mere study of functions, an analysis of statical relations. Of course, if there were really any philosophers who said that the connexion between teeth and mastication was entirely accidental, the Aristotelian doctrine was a useful protest against such an absurdity; but when we have established a fixed connexion between organ and function, we are bound to explain the association in some more satisfactory manner than by reaffirming it in general terms, which is all that Aristotle ever does. Again, whatever may be the relative justification of teleology as a study of functions in the living body, we have no grounds for interpreting the phenomena of inorganic nature on an analogous principle. Some Greek philosophers were acute enough to perceive the distinction. While admitting that plants and animals showed traces of design, they held that the heavenly bodies arose spontaneously from the movements of a vortex or some such cause;222 just as certain religious savants of our own day reject the Darwinian theory while accepting the nebular hypothesis.223 But to Aristotle the unbroken regularity of the celestial movements, which to us is the best proof of their purely mechanical nature, was, on the contrary, a proof that they were produced and directed by an absolutely reasonable purpose; much more so indeed than terrestrial organisms, marked as these are by occasional deviations and imperfections; and he concludes that each of those movements must be directed towards the attainment of some correspondingly consummate end;224 while, again, in dealing with those precursors of Mr. Darwin, if such they can be called, who argued that the utility of an organ does not disprove its spontaneous origin, since only the creatures which, by a happy accident, came to possess it would survive��he334 answers that the constant reproduction of such organs is enough to vindicate them from being the work of chance;225 thus displaying his inability to distinguish between the two ideas of uniform causation and design.Drawings represent and explain the machinery to which they relate as the symbols in algebra represent quantities, and in a degree admit of the same modifications and experiments to which the machinery itself could be subjected if it were already constructed. Drawings are also an important aid in developing designs or conceptions. It is impossible to conceive of, and retain in the mind, all the parts of a complicated machine, and their relation to each other, without some aid to fix the various ideas as they arise, and keep them in sight for comparison; like compiling statistics, the footings must be kept at hand for reference, and to determine the relation that one thing may bear to another.

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