Now as we can understand a mechanism to the extent of seeing the bearing of part upon part, and even of all the parts upon the work it does, without going on to think about the designer or his design; and without explicitly considering it as designed; so we can and do think of the world and recognize order in it, and see the bearing of part upon part without going back to God or forward to God's purposes. Indeed, so far as we use the argument from design to prove the existence of God, it means that we first apprehend this order and regular sequence of events, and then, as a second and distinct step, put it down to design. For although God is the prior cause of design and of all creation, yet design and creation is the prior cause of our knowing God, The conception of a rational and moral world leads us to the conception of a rational and moral origin, i.e., to theism. Further, it is plain that this same order and regularity is recognized by many who refuse to see design in it, and who invent other hypotheses to account for it; and of one of these hypotheses we shall presently speak at length.
Now, if I take any single organism and study it carefully, simply as a biologist or physiologist, I shall recognize in it certain regularities of structure and function and development, upon which I can found various arguments and predictions. I can argue from its general characteristics, to the nature of its environment and habits and modes of life; or from its earlier stages, to what it will be when more fully developed; and these arguments will be quite unaffected by any theory I may hold as to the origin of these changes, and as to the causes of these adaptations. The order and regularity on which my predictions are based is an admitted fact. Theism or materialism are only theories by which that fact is explained. Now, for mind in the abstract, theism is really as much a presupposition of that fact, as the predicted truth is a consequence of it. Both are logically connected with it, and yet neither is derived from it through the other.
If, however, we cannot thus observe and calculate on certain regularities and tendencies in the world as we know it, then, not only is the appearance of design and finality an illusion, not only is that particular argument for theism cut away, but with it goes all scientific certainty, all that stands between us and the most hopeless mental and moral scepticism.
It is not our immediate concern to prove the value of the "argument from adaptability," but simply to show that it is logically (though not really) unaffected by the question of theism and finality and design. As long as we admit those same effects and consequences of which design is one explanation, but of which others are prima facie conceivable; as long as we hold that the world works on the whole as though it were designed; that the present anticipates and prepares for the future; that the future and absent can be predicted from the present, so long do we hold all upon which the "argument of adaptability" is strictly based. And indeed, as has been said, if once it be admitted that the general progressive tendency on the part of living things is towards a greater harmony and correspondence with surrounding reality, then that argument is a more immediate inference from the existence of an orderly world, than is theism.
Though both are strictly independent deductions from the same principle (i.e., from an orderly world), yet theism and the argument from adaptability when once deduced, confirm one another. For it is not hard to show that theism is better adapted to man's higher needs, than atheism or polytheism or pantheism; while if theism be once granted, then, as we said in the last section, the argument from adaptability is much more easily established.
There have been at various times several philosophies or attempted explanations of the world, which have either denied or prescinded from theism and finality. These two conceptions may be considered as one; for by finality we mean the intelligent direction of means towards a preconceived end; and therefore to admit a pervading finality, is to imply a theistic origin and government of the universe.
Perhaps, the best and most finished attempt to explain the world independently of finality is the philosophy of Evolution, so widely popularized in our own day; and since it is in the region of organic existence, that finalism looks for its chief basis, it is especially by Darwinistic Evolution that its force is supposed to be destroyed.
Any form of "monism" gets rid of finality more easily than does any form of dualism; and again, any form of materialism, more easily than idealism; and therefore as monistic and materialistic (at least in some sense of the term), popular Evolutionism is the best plea for non-finalist philosophy. We propose therefore briefly to examine this philosophy, so far as it claims to be such, and to see whether it in any way touches the validity of the argument from adaptability.
Evolution may be considered both as an empirical fact and as an aetiological theory or philosophy. Considered as a fact, it is the statement of observed processes, and belongs to positive science like the observed courses of the planets, or any other observed regularities and uniformities. Science professes to have found everywhere as far as its experience has extended—in astronomy, geology, physiology, biology, psychology, ethics, sociology—a uniform process of change from the simple to the complex, from the indefinite and unstable to the stable and definite; and with this statement, so far as it can be verified, the positivist should rest content, seeking no theory, and drawing no generalization. But, the mind cannot hold together such collected facts without some binding theory, nor even observe a single fact without some preconception to give meaning to its suggested outlines: for what we really get from our senses bears but a slight ratio to what we fill in with our mind. Hence, answering to this supposed, but far from proven, universality of Evolution as a fact,[4] we have a certain philosophy of Evolution which takes us out of the sphere of facts into that of hypotheses and generalizations, and tries to give meaning and unity to the positive information that physical science has collected and classified; to finish, as it were, the suggested curves; to fill up the lacunae of observation; to extend to the whole world what is known of the part; and perhaps to erect into a cause what is only an orderly statement of facts. Undoubtedly it is this last fallacy that makes it more easy for evolutionists to dispense with or ignore finality. Law in its first sense is an expression of effectual human will. Call Evolution a law and the popular mind will soon vaguely conceive it as a rule or uniformity resulting from some kind of unconscious will-power at the back of everything; and this Will-Power stops the gap created in our thought by the exclusion of theism and finality. This confusion is furthered still more by not distinguishing between the cause of a fact and the cause of our knowledge of the fact. If I act in willing conformity with the civil law, I also act in obedience to it, in some way coerced by its authority and its sanctions. The law is really a cause of my action; because it represents the fixed will and effectual power of the ruler. But when this conception and name is transferred by analogy to physical uniformities of action, an event which conforms to the observed law or regularity of sequence, is not really caused by the law unless we suppose that law to be representative of something equivalent to a fixed will from which it originates. Yet we say loosely, such an event happens in consequence of the law of attraction; meaning only, in conformity with the law, so as to verify the law, to follow from it logically. Thus again the law comes to be mistaken for an effectual power of some kind, whereas it is merely a sort of regularity that might result either from an intelligent will or from something equivalent. But in thus adroitly slipping-in the conception of a governing force or tendency, or even in openly asserting it, with Schopenhauer or Hartmann, and in explaining the graduated resemblances of species by the origin of one from the other, and in extending this mode of Evolution in all directions from the known to the unknown so as to make it pervade the universe, we at once cease to be faithful positivists and, becoming philosophers, must submit to philosophic criticism, since these problems cannot be settled merely by an appeal to facts. Thus when Professor Mivart speaks of Evolution as "the continuous progress of the material universe by the unfolding of latent potentialities in harmony with a preordained end," the latent potentialities, the preordained end, the procession of one species from another, the extension of this law to every difference of time and place—all are matters of hypothesis or intuition; but by no means of exterior observation.
The most that observation gives us is the very imperfect suggestion of the track that such a movement would have left behind it, not unlike the scraps that boys litter along the road in a paper-chase. Similarly, if in the case of organic Evolution we deny all latent potentialities and preordained ends and throw the whole burden on accidental variations and natural selection; if we regard the whole process as no more intelligent or designed than that by which water seeks and finds its own level; yet as in the case of water we must perforce introduce "a gravitating tendency," so in the case of living organisms a "persisting" or "struggling tendency," as an hypothesis to give unity to our facts or to account for their uniformity. But these tendencies are as little matter of observation as the aforesaid latent potentialities or preordained ends. In fine, Evolution, whatever form it take, gets rid of theism and finality only by slipping into their place some tendency or indefinable power which it considers adequate to account for the facts to be explained.