[Footnote 267: ][ (return) ] Id., ib., vol. ii. p. 490.
[Footnote 268: ][ (return) ] Martin's "Organic Unity in Animals and Vegetables," in M. Q. Review, January, 1863.
It is hardly worth while to reply to the lame argument of Geoffroy, which needs a "crutch" for its support. The very illustration, undignified and irrelevant as it is, tells altogether against its author. For, first, the crutch is certainly a contrivance designed for locomotion; secondly, the length and strength and lightness of the crutch are all matters of calculation and adjustment; and, thirdly, all the adaptations of the crutch are well-considered, in order to enable the lame man to walk; the function of the crutch is the final cause of its creation. This crutch is clearly out of place in Geoffroy's argument, and utterly breaks down. It is in its place in the teleological argument, and stands well, though it may not behave as well as the living limb. The understanding of a child can perceive that the design-argument does not assert that men were intended to have amputated limbs, but that crutches are designed for those whose limbs are paralyzed or amputated.
The existence of useless members, of rudimentary and abortive limbs, does seem, at first sight, to be unfavorable to the idea of supremacy of purpose and all-pervading design. It should be remarked, however, that this is an argument based upon our ignorance, and not upon our knowledge. It does not by any means follow that because we have discovered no reasons for their existence, therefore there are no reasons. Science, in enlarging its conquests of nature, is perpetually discovering the usefulness of arrangements of which our fathers were ignorant, and the reasons of things which to their minds, were concealed; and it ill becomes the men who so far "mistrust their own feeble powers" as to be afraid of ascribing any intention to God or nature, to dogmatically affirm there is no purpose in the existence of any thing. And then we may ask, what right have these men to set up the idea of "utility" as the only standard to which the Creator must conform? How came they to know that God is a mere "utilitarian;" or, if they do not believe in God, that nature is a miserable "Benthamite?" Why may not the idea of beauty, of symmetry, of order, be a standard for the universe, as much as the idea of utility, or mere subordination to some practical end? May not conformity to one grand and comprehensive plan, sweeping over all nature, be perfectly compatible with the adaptation of individual existences to the fulfillment of special ends? In civil architecture we have conformity to a general plan; we have embellishment and ornament, and we have adaptation to a special purpose, all combined; why may not these all be combined in the architecture of the universe? The presence of any one of these is sufficient to prove design, for mere ornament or beauty is itself a purpose, an object, and an end. The concurrence of all these is an overwhelming evidence of design. Wherever found, they are universally recognized as the product of intelligence; they address themselves at once to the intelligence of man, and they place him in immediate relation to and in deepest sympathy with the Intelligence which gave them birth. He that formed the eye of man to see, and the heart of man to admire beauty, shall He not delight in it? He that gave the hand of man its cunning to create beauty, shall He not himself work for it? And if man can and does combine both "ornament" and "use" in one and the same implement or machine, why should not the Creator of the world do the same? "When the savage carves the handle of his war-club, the immediate purpose of his carving is to give his own hand a firmer hold. But any shapeless scratches would be enough for this. When he carves it in an elaborate pattern, he does so for the love of ornament, and to satisfy the sense of beauty." And so "the harmonies, on which all beauty depends, are so connected in nature that use and ornament may often both arise out of the same conditions." [269]
[Footnote 269: ][ (return) ] Duke of Argyll, "Reign of Law," p. 203.
The "true naturalist," therefore, recognizes two great principles pervading the universe--a principle of order--a unity of plan, and a principle of special adaptation, by which each object, though constructed upon a general plan, is at the same time accommodated to the place it has to occupy and the purpose it has to serve. In other words, there is homology of structure and analogy of function, conformity to archetypal forms and Teleology of organs, in wonderful combination. Now, in the Materialistic school, it has been the prevalent practice to set up the unity of plan in animal structures, in opposition to the principle of Final Causes: Morphology has been opposed to Teleology. But in nature there is no such opposition; on the contrary, there is a beautiful co-ordination. The same bones, in different animals, are made subservient to the widest possible diversity of functions. The same limbs are converted into fins, paddles, wings, legs, and arms. "No comparative anatomist has the slightest hesitation in admitting that the pectoral fin of a fish, the wing of a bird, the paddle of the dolphin, the fore-leg of a deer, the wing of a bat, and the arm of a man, are the same organs, notwithstanding that their forms are so varied, and the uses to which they are applied so unlike each other." [270] All these are homologous in structure--they are formed after an ideal archetype or model, but that model or type is variously modified to adapt the animal to the sphere of life in which it is destined to move, and the organ itself to the functions it has to perform, whether swimming, flying, walking, or burrowing, or that varied manipulation of which the human hand is capable. These varied modifications of the vertebrated type, for special purposes, are unmistakable examples of final causation. Whilst the silent members, the rudimental limbs instanced by Oken, Martins, and others--as fulfilling no purpose, and serving no end, exist in conformity to an ideal archetype on which the bony skeletons of all vertebrated animals are formed, [271] and which has never been departed from since time began. This type, or model, or plan, is, however, itself an evidence of design as much as the plan of a house. For to what standard are we referring when we say that two limbs are morphologically the same? Is it not an ideal plan, a mental pattern, a metaphysical conception? Now an ideal implies a mind which preconceived the idea, and in which alone it really exists. It is only as "an order of Divine thought" that the doctrine of animal homologies is at all intelligible; and Homology is, therefore, the science which traces the outward embodiment of a Divine Idea. [272] The principle of intentionality or final causation, then, is not in any sense invalidated by the discovery of "a unity of plan" sweeping through the entire universe.
[Footnote 270: ][ (return) ] Carpenter's "Comparative Physiology," p. 37.
[Footnote 271: ][ (return) ] Agassiz, "Essay on Classification," p. 10.
[Footnote 272: ][ (return) ] Whewell's "History of Inductive Sciences," vol. i. p. 644; "The Reign of Law," p. 208; Agassiz, "Essay on Classification," pp. 9-11.