As regards the first kind of Zweckmässigkeit, that which is ohne Zweck—the purposiveness of a beautiful object which does not seem to be directed to any external end—there are two ways in which we may account for it. We may either say that it was actually designed to be beautiful by the Supreme Force behind Nature, or we may say that purposiveness is not really resident in nature, but that our perception of it is due to the subjective needs of our judging faculty. We have to contemplate beautiful objects as if they were purposive, but they may not be so in reality. And this latter idealistic doctrine is what Kant falls back upon. He appeals in support of it, to the phenomena of crystallisation (pp. 243 sqq.), in which many very beautiful forms seem to be produced by merely mechanical processes. The beauty of a rock crystal is apparently produced without any forethought on the part of nature, and he urges that we are not justified in asserting dogmatically that any laws distinct from those of mechanism are needed to account for beauty in other cases. Mechanism can do so much; may it not do all? And he brings forward as a consideration which ought to settle the question, the fact that in judging of beauty “we invariably seek its gauge in ourselves a priori”; we do not learn from nature, but from ourselves, what we are to find beautiful. Mr. Kennedy in his Donnellan Lectures has here pointed out several weak spots in Kant’s armour. In the first place, the fact that we seek the gauge of beauty in our own mind “may be shown from his own definition to be a necessary result of the very nature of beauty.”2 For Kant tells us that the aesthetical judgement about beauty always involves “a reference of the representation to the subject”; and this applies equally to judgements about the beautiful in Art and the beautiful in Nature. But no one could maintain that from this definition it follows that we are not compelled to postulate design in the mind of the artist who paints a beautiful picture. And thus as the fact that “we always seek the gauge of beauty” in ourselves does not do away with the belief in a designing mind when we are contemplating works of art, it cannot be said to exclude the belief in a Master Hand which moulded the forms of Nature. As Cicero has it, nature is “non artificiosa solum, sed plane artifex.” But the cogency of this reasoning, for the details of which I must refer the reader to Mr. Kennedy’s pages, becomes more apparent when we reflect on that second form of purposiveness, viz. adaptation to definite ends, with which we meet in the phenomena of organic life.
If we watch, e.g. the growth of a tree we perceive that its various parts are not isolated and unconnected, but that on the contrary they are only possible by reference to the idea of the whole. Each limb affects every other, and is reciprocally affected by it; in short “in such a product of nature every part not only exists by means of the other parts, but is thought as existing for the sake of the others and the whole” (p. 277). The operations of nature in organised bodies seem to be of an entirely different character from mere mechanical processes; we cannot construe them to ourselves except under the hypothesis that nature in them is working towards a designed end. The distinction between nature’s “Technic” or purposive operation, and nature’s Mechanism is fundamental for the explanation of natural law. The language of biology eloquently shows the impossibility of eliminating at least the idea of purpose from our investigations into the phenomena of life, growth, and reproduction. And Kant dismisses with scant respect that cheap and easy philosophy which would fain deny the distinctiveness of nature’s purposive operation. A doctrine, like that of Epicurus, in which every natural phenomenon is regarded as the result of the blind drifting of atoms in accordance with purely mechanical laws, really explains nothing, and least of all explains that illusion in our teleological judgements which leads us to assume purpose where really there is none.
It has been urged by Kirchmann and others that this distinction between Technic and Mechanism, on which Kant lays so much stress, has been disproved by the progress of modern science. The doctrines, usually associated with the name of Darwin, of Natural Selection and Survival of the Fittest, quite sufficiently explain, it is said, on mechanical principles the semblance of purpose with which nature mocks us. The presence of order is not due to any purpose behind the natural operation, but to the inevitable disappearance of the disorderly. It would be absurd, of course, to claim for Kant that he anticipated the Darwinian doctrines of development; and yet passages are not wanting in his writings in which he takes a view of the continuity of species with which modern science would have little fault to find. “Nature organises itself and its organised products in every species, no doubt after one general pattern but yet with suitable deviations, which self-preservation demands according to circumstances” (p. 279). “The analogy of forms, which with all their differences seem to have been produced according to a common original type, strengthens our suspicions of an actual relationship between them in their production from a common parent, through the gradual approximation of one animal genus to another—from those in which the principle of purposes seems to be best authenticated, i.e. from man, down to the polype and again from this down to mosses and lichens, and finally to crude matter. And so the whole Technic of nature, which is so incomprehensible to us in organised beings that we believe ourselves compelled to think a different principle for it, seems to be derived from matter and its powers according to mechanical laws (like those by which it works in the formation of crystals)” (p. 337). Such a theory he calls “a daring venture of reason,” and its coincidences with modern science are real and striking. But he is careful to add that such a theory, even if established, would not eliminate purpose from the universe; it would indeed suggest that certain special processes having the semblance of purpose may be elucidated on mechanical principles, but on the whole, purposive operation on the part of Mother Nature it would still be needful to assume (p. 338). “No finite Reason can hope to understand the production of even a blade of grass by mere mechanical causes” (p. 326). “It is absurd to hope that another Newton will arise in the future who shall make comprehensible by us the production of a blade of grass according to natural laws which no design has ordered” (p. 312).
Crude materialism thus affording no explanation of the purposiveness in nature, we go on to ask what other theories are logically possible. We may dismiss at once the doctrine of Hylozoism, according to which the purposes in nature are explained in reference to a world-soul, which is the inner principle of the material universe and constitutes its life. For such a doctrine is self-contradictory, inasmuch as lifelessness, inertia, is the essential characteristic of matter, and to talk of living matter is absurd (p. 304). A much more plausible system is that of Spinoza, who aimed at establishing the ideality of the principle of natural purposes. He regarded the world whole as a complex of manifold determinations inhering in a single simple substance; and thus reduced our concepts of the purposive in nature to our own consciousness of existing in an all-embracing Being. But on reflection we see that this does not so much explain as explain away the purposiveness of nature; it gives us an unity of inherence in one Substance, but not an unity of causal dependence on one Substance (p. 303). And this latter would be necessary in order to explain the unity of purpose which nature exhibits in its phenomenal working. Spinozism, therefore, does not give what it pretends to give; it puts us off with a vague and unfruitful unity of ground, when what we seek is a unity that shall itself contain the causes of the differences manifest in nature.
We have left then as the only remaining possible doctrine, Theism, which represents natural purposes as produced in accordance with the Will and Design of an Intelligent Author and Governor of Nature. This theory is, in the first place, “superior to all other grounds of explanation” (p. 305), for it gives a full solution of the problem before us and enables us to maintain the reality of the Zweckmässigkeit of nature. “Teleology finds the consummation of its investigations only in Theology” (p. 311). To represent the world and the natural purposes therein as produced by an intelligent Cause is “completely satisfactory from every human point of view for both the speculative and practical use of our Reason” (p. 312). Thus the contemplation of natural purposes, i.e. the common Argument from Design, enables us to reach a highest Understanding as Cause of the world “in accordance with the principles of the reflective Judgement, i.e. in accordance with the constitution of our human faculty of cognition” (p. 416).
It is in this qualifying clause that Kant’s negative attitude in respect of Theism betrays itself. He regards it as a necessary assumption for the guidance of scientific investigation, no less than