the Idea of the effect of the causality of the cause as the fundamental condition, in the cause, of the possibility of the effect. This can take place in two ways. We may regard the effect directly as an art product, or only as material for the art of other possible natural beings; in other words, either as a purpose or as a means towards the purposive employment of other causes. This latter purposiveness is called utility (for man) or mere advantage (for other creatures), and is merely relative; while the former is an inner purposiveness of the natural being.
For example, rivers bring down with them all kinds of earth serviceable for the growth of plants which sometimes is deposited inland, often also at their mouths. The tide brings this mud to many coasts over the land or deposits it on the shore; and so, more especially if men give their aid so that the ebb shall not carry it back again, the fruit-bearing land increases in area, and the vegetable kingdom gains the place which formerly was the habitation of fish and shells. In this way has nature itself brought about most of the extensions of the land, and still continues to do so, although very slowly.--Now the question is whether this is to be judged a purpose of nature, because it contains utility for men. We cannot put it down to the account of the vegetable kingdom, because just as much is subtracted from sea-life as is added to land-life.
Or, to give an example of the advantageousness of certain natural things as means for other creatures (if we suppose them to be means), no soil is more suitable to pine trees than a sandy soil. Now the deep sea, before it withdrew from the land, left behind large tracts of sand in our northern regions, so that on this soil, so unfavourable for all cultivation, widely extended pine forests were enabled to grow, for the unreasoning destruction of which we frequently blame our ancestors.
We may ask if this original deposit of tracts of sand was a purpose of nature for the benefit of the possible pine forests? So much is clear, that if we regard this as a purpose of nature, we must also regard the sand as a relative purpose, in reference to which the ocean strand and its withdrawal were means: for in the series of the mutually subordinated members of a purposive combination, every member must be regarded as a purpose (though not as a final purpose), to which its proximate cause is the means. So too if cattle, sheep, horses, etc., are to exist, there must be grass on the earth, but there must also be saline plants in the desert if camels are to thrive; and again these and other herbivorous animals must be met with in numbers if there are to be wolves, tigers, and lions. Consequently the objective purposiveness, which is based upon advantage, is not an objective purposiveness of things in themselves; as if the sand could not be conceived for itself as an effect of a cause, viz. the sea, without attributing to the latter a purpose, and regarding the effect, namely, the sand, as a work of art. It is a merely relative purposiveness contingent upon the thing to which it is ascribed; and although in the examples we have cited, the different kinds of grass are to be judged as in themselves organised products of nature, and consequently as artificial, yet are they to be regarded, in reference to the beasts which feed upon them, as mere raw material.
But above all, though man, through the freedom of his causality, finds certain natural things of advantage for his designs--designs often foolish, such as using the variegated plumage of birds to adorn his clothes, or coloured earths and the juices of plants for painting his face; often again reasonable as when the horse is used for riding, the ox or (as in Minorca) the ass or pig for ploughing--yet we cannot even here assume a relative natural purpose. For his Reason knows how to give things a conformity with his own arbitrary fancies for which he was not at all predestined by nature. Only, _if_ we assume that men are to live upon the earth, then the means must be there without which they could not exist as animals, and even as rational animals (in however low a degree of rationality); and thereupon those natural things, which are indispensable in this regard, must be considered as natural purposes.
We can hence easily see that external purposiveness (advantage of one thing in respect of others) can be regarded as an external natural purpose only under the condition, that the existence of that [being], to which it is immediately or distantly advantageous, is in itself a purpose of nature. Since that can never be completely determined by mere contemplation of nature, it follows that relative purposiveness, although it hypothetically gives indications of natural purposes, yet justifies no absolute teleological judgement.
Snow in cold countries protects the crops from the frost; it makes human intercourse easier (by means of sleighs). The Laplander finds in his country animals by whose aid this intercourse is brought about, _i.e._ reindeer, who find sufficient sustenance in a dry moss which they have to scratch out for themselves from under the snow, and who are easily tamed and readily permit themselves to be deprived of that freedom in which they could have remained if they chose. For other people in the same frozen regions marine animals afford rich stores; in addition to the food and clothing which are thus supplied, and the wood which is floated in by the sea to their dwellings, these marine animals provide material for fuel by which their huts are warmed. Here is a wonderful concurrence of many references of nature to one purpose; and all this applies to the cases of the Greenlander, the Lapp, the Samoyede, the inhabitant of Yakutsk, etc. But then we do not see why, generally, men must live there at all. Therefore to say that vapour falls out of the atmosphere in the form of snow, that the sea has its currents which float down wood that has grown in warmer lands, and that there are in it great sea monsters filled with oil, _because_ the idea of advantage for certain poor creatures is fundamental for the cause which collects all these natural products, would be a very venturesome and arbitrary judgement. For even if there were none of this natural utility, we should miss nothing as regards the adequateness of natural causes to nature’s constitution; much more even to desire such a tendency in, and to attribute such a purpose to, nature would be the part of a presumptuous and inconsiderate fancy. For indeed it might be observed that it could only have been the greatest unsociability among men which thus scattered them into such inhospitable regions.
§ 64. _Of the peculiar character of things as natural purposes_ In order to see that a thing is only possible as a purpose, that is, to be forced to seek the causality of its origin not in the mechanism of nature but in a cause whose faculty of action is determined through concepts, it is requisite that its form be not possible according to mere natural laws, _i.e._ laws which can be cognised by us through the Understanding alone when applied to objects of Sense; but that even the empirical knowledge of it as regards its cause and effect presupposes concepts of Reason. This _contingency_ of its form in all empirical natural laws in reference to Reason affords a ground for regarding its causality as possible only through Reason. For Reason, which must cognise the necessity of every form of a natural product in order to comprehend even the conditions of its genesis, cannot assume such [natural] necessity in that particular given form. The causality of its origin is then referred to the faculty of acting in accordance with purposes (a will); and the Object which can only thus be represented as possible is represented as a purpose.
If in a seemingly uninhabited country a man perceived a geometrical figure, say a regular hexagon, inscribed on the sand, his reflection busied with such a concept would attribute, although obscurely, the unity in the principle of its genesis to Reason, and consequently would not regard as a ground of the possibility of such a shape the sand, or the neighbouring sea, or the winds, or beasts with familiar footprints, or any other irrational cause. For the chance against meeting with such a concept, which is only possible through Reason, would seem so infinitely great, that it would be just as if there were no natural law, no cause in the mere mechanical working of nature capable of producing it; but as if only the concept of such an Object, as a concept which Reason alone can supply and with which it can compare the thing, could contain the causality for such an effect. This then would be regarded as a purpose, but as a product of _art_, not as a natural purpose (_vestigium hominis video_).[106] But in order to regard a thing cognised as a natural product as a purpose also--consequently as a _natural purpose_, if this is not a contradiction--something more is required. I would say provisionally: a thing exists as a natural purpose, if it is [although in a double sense][107] both _cause and effect of itself_. For herein lies a causality the like of which cannot be combined with the mere concept of a nature without attributing to it a purpose; it can certainly be thought without contradiction, but cannot be comprehended. We shall elucidate the determination of this Idea of a natural purpose by an example, before we analyse it completely.
In the first place, a tree generates another tree according to a known natural law. But the tree produced is of the same genus; and so it produces itself _generically_. On the one hand, as effect it is continually self-produced; on the other hand, as cause it continually produces itself, and so perpetuates itself generically.
Secondly, a tree produces itself as an _individual_. This kind of effect no doubt we call growth; but it is quite different from any increase according to mechanical laws, and is to be reckoned as generation, though under another name. The matter that the tree incorporates it previously works up into a specifically peculiar quality, which natural mechanism external to it cannot supply; and thus it develops itself by aid of a material which, as compounded, is its own product. No doubt, as regards the constituents got from nature without, it must only be regarded as an educt; but yet in the separation and recombination of this raw material we see such an originality in the separating and formative faculty of this kind of natural being, as is infinitely beyond the reach of art, if the attempt is made to reconstruct such vegetable products out of elements obtained by their dissection or material supplied by nature for their sustenance.
_Thirdly_, each part of a tree generates itself in such a way that the maintenance of any one part depends reciprocally on the maintenance of the rest. A bud of one tree engrafted on the twig of another produces in the alien stock a plant of its own kind, and so also a scion engrafted on a foreign stem. Hence we may regard each twig or leaf of the same tree as merely engrafted or inoculated into it, and so as an independent tree attached to another and parasitically nourished by it. At the same time, while the leaves are products of the tree they also in turn give support to it; for the repeated defoliation of a tree kills it, and its growth thus depends on the action of the leaves upon the stem. The self-help of nature in case of injury in the vegetable creation, when the want of a part that is necessary for the maintenance of its neighbours is supplied by the remaining parts; and the abortions or malformations in growth, in which certain parts, on account of casual defects or hindrances, form themselves in a new way to maintain what exists, and so produce an anomalous creature, I shall only mention in passing, though they are among the most wonderful properties of organised creatures.
§ 65. _Things regarded as natural purposes are organised beings_ According to the character alleged in the preceding section, a thing, which, though a natural product, is to be cognised as only possible as a natural purpose, must bear itself alternately as cause and as effect.
This, however, is a somewhat inexact and indeterminate expression which needs derivation from a determinate concept.
Causal combination as thought merely by the Understanding is a connexion constituting an ever-progressive series (of causes and effects); and things which as effects presuppose others as causes cannot be reciprocally at the same time causes of these. This sort of causal combination we call that of effective causes (_nexus effectivus_). But on the other hand, a causal combination according to a concept of Reason (of purposes) can also be thought, which regarded as a series would lead either forwards or backwards; in this the thing that has been called the effect may with equal propriety be termed the cause of that of which it is the effect. In the practical department of human art we easily find connexions such as this; _e.g._ a house, no doubt, is the cause of the money received for rent, but also conversely the representation of this possible income was the cause of building the house. Such a causal connexion we call that of final causes (_nexus finalis_). We may perhaps suitably name the first the connexion of real causes, the second of those which are ideal; because from this nomenclature it is at once comprehended that there can be no more than these two kinds of causality.
For a thing to be a natural purpose in the _first_ place it is requisite that its parts (as regards their being and their form) are only possible through their reference to the whole. For the thing itself is a purpose and so is comprehended under a concept or an Idea which must determine _a priori_ all that is to be contained in it.
But so far as a thing is only thought as possible in this way, it is a mere work of art; _i.e._ a product of one rational cause distinct from the matter (of the parts), whose causality (in the collection and combination of the parts) is determined through its Idea of a whole possible by their means (and consequently not through external nature).
But if a thing as a natural product is to involve in itself and in its internal possibility a reference to purposes,--_i.e._ to be possible only as a natural purpose, and without the causality of the concepts of rational beings external to itself,--then it is requisite _secondly_ that its parts should so combine in the unity of a whole that they are reciprocally cause and effect of each other’s form. Only in this way can the Idea of the whole conversely (reciprocally) determine the form and combination of all the parts; not indeed as cause--for then it would be an artificial product--but as the ground of cognition, for him who is judging it, of the systematic unity and combination of all the manifold contained in the given material.
For a body then which is to be judged in itself and its internal possibility as a natural purpose, it is requisite that its parts mutually depend upon each other both as to their form and their combination, and so produce a whole by their own causality; while conversely the concept of the whole may be regarded as its cause according to a principle (in a being possessing a causality according to concepts adequate to such a product). In this case then the connexion of _effective causes_ may be judged as an _effect through final causes_.
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, that is as an (organic) instrument. Thus, however, it might be an artificial instrument, and so might be represented only as a purpose that is possible in general; but also its parts are all organs reciprocally _producing_ each other. This can never be the case with artificial instruments, but only with nature which supplies all the material for instruments (even for those of art). Only a product of such a kind can be called a _natural purpose_, and this because it is an _organised_ and _self-organising being_.
In a watch one part is the instrument for moving the other parts, but the wheel is not the effective cause of the production of the others; no doubt one part is for the sake of the others, but it does not exist by their means. In this case the producing cause of the parts and of their form is not contained in the nature (of the material), but is external to it in a being which can produce effects according to Ideas of a whole possible by means of its causality. Hence a watch wheel does not produce other wheels, still less does one watch produce other watches, utilising (organising) foreign material for that purpose; hence it does not replace of itself parts of which it has been deprived, nor does it make good what is lacking in a first formation by the addition of the missing parts, nor if it has gone out of order does it repair itself--all of which, on the contrary, we may expect from organised nature.--An organised being is then not a mere machine, for that has merely _moving_ power, but it possesses in itself _formative_ power of a self-propagating kind which it communicates to its materials though they have it not of themselves; it organises them, in fact, and this cannot be explained by the mere mechanical faculty of motion.
We say of nature and its faculty in organised products far too little if we describe it as an _analogon of art_; for this suggests an artificer (a rational being) external to it. Much rather does it organise 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. We perhaps approach nearer to this inscrutable property, if we describe it as an _analogon of life_; but then we must either endow matter, as mere matter, with a property which contradicts its very being (hylozoism), or associate therewith an alien principle _standing in communion_ with it (a soul). But in the latter case we must, if such a product is to be a natural product, either presuppose organised matter as the instrument of that soul, which does not make the soul a whit more comprehensible; or regard the soul as artificer of this structure and so remove the product from (corporeal) nature. To speak strictly, then, the organisation of nature has in it nothing analogous to any causality we know.[108] Beauty in nature can be rightly described as an analogon of art, because it is ascribed to objects only in reference to reflection upon their _external_ aspect, and consequently only on account of the form of their external surface. But _internal natural perfection_, as it belongs to those things which are only possible as _natural purposes_, and are therefore called organised beings, is not analogous to any physical, _i.e._ natural, faculty known to us; nay even, regarding ourselves as, in the widest sense, belonging to nature, it is not even thinkable or explicable by means of any exactly fitting analogy to human art.
The concept of a thing as in itself a natural purpose is therefore no constitutive concept of Understanding or of Reason, but it can serve as a regulative concept for the reflective Judgement, to guide our investigation about objects of this kind by a distant analogy with our own causality according to purposes generally, and in our meditations upon their ultimate ground. This latter use, however, is not in reference to the knowledge of nature or of its original ground, but rather to our own practical faculty of Reason, in analogy with which we considered the cause of that purposiveness.
Organised beings are then the only beings in nature which, considered in themselves and apart from any relation to other things, can be thought as possible only as purposes of nature. Hence they first afford objective reality to the concept of a _purpose of nature_, as distinguished from a practical purpose; and so they give to the science of nature the basis for a teleology, _i.e._ a mode of judgement about natural Objects according to a special principle which otherwise we should in no way be justified in introducing (because we cannot see _a priori_ the possibility of this kind of causality).
§ 66. _Of the principle of judging of internal purposiveness in organised beings_ This principle, which is at the same time a definition, is as follows: _An organised product of nature is one in which every part is reciprocally purpose, [end] and means._ In it nothing is vain, without purpose, or to be ascribed to a blind mechanism of nature.
This principle, as regards its occasion, is doubtless derived from experience, viz. from that methodised experience called observation; but on account of the universality and necessity which it ascribes to such purposiveness it cannot rest solely on empirical grounds, but must have at its basis an _a priori_ principle, although it be merely regulative and these purposes lie only in the idea of the judging [subject] and not in an effective cause. We may therefore describe the aforesaid principle as a _maxim_ for judging of the internal purposiveness of organised beings.
It is an acknowledged fact that the dissectors of plants and animals, in order to investigate their structure and to find out the reasons, why and for what end such parts, such a disposition and combination of parts, and just such an internal form have been given them, assume as indisputably necessary the maxim that nothing in such a creature is _vain_; just as they lay down as the fundamental proposition of the universal science of nature, that _nothing_ happens _by chance_.
In fact, they can as little free themselves from this teleological proposition as from the universal physical proposition; for as without the latter we should have no experience at all, so without the former we should have no guiding thread for the observation of a species of natural things which we have thought teleologically under the concept of natural purposes.
Now this concept brings the Reason into a quite different order of things from that of a mere mechanism of nature, which is no longer satisfying here. An Idea is to be the ground of the possibility of the natural product. But because this is an absolute unity of representation, instead of the material being a plurality of things that can supply by itself no definite unity of composition,--if that unity of the Idea is to serve at all as the _a priori_ ground of determination of a natural law of the causality of such a form of composition,--the purpose of nature must be extended to _everything_ included in its product. For if we once refer action of this sort _on the whole_ to any supersensible ground of determination beyond the blind mechanism of nature, we must judge of it altogether according to this principle; and we have then no reason to regard the form of such a thing as partly dependent on mechanism--for by such mixing up of disparate principles no certain rule of judging would be left.
For example, it may be that in an animal body many parts can be conceived as concretions according to mere mechanical laws (as the hide, the bones, the hair). And yet the cause which brings together the required matter, modifies it, forms it, and puts it in its appropriate place, must always be judged of teleologically; so that here everything must be considered as organised, and everything again in a certain relation to the thing itself is an organ.
§ 67. _Of the principle of the teleological judging of nature in general as a system of purposes_ We have already said above that the _external_ purposiveness of natural things affords no sufficient warrant for using them as purposes of nature in order to explain their presence, and for regarding their contingently purposive effects as the grounds of their presence according to the principle of final causes. Thus we cannot take for natural purposes, _rivers_ because they promote intercourse among inland peoples, _mountains_ because they contain the sources of the rivers and for their maintenance in rainless seasons have a store of snow, or the _slope_ of the land which carries away the water and leaves the country dry; because although this shape of the earth’s surface be very necessary for the origin and maintenance of the vegetable and animal kingdoms, it has nothing in itself for the possibility of which we are forced to assume a causality according to purposes. The same is true of plants which man uses for his needs or his pleasures; of beasts, the camel, the ox, the horse, dog, etc., which are indispensable to him as well for food as because they are used in his service in many different ways. In the case of things which we have no reason for regarding in themselves as purposes, such external relation can only be hypothetically judged as purposive.
To judge of a thing as a natural purpose on account of its internal form is something very different from taking the existence of that thing to be a purpose of nature. For the latter assertion we require not merely the concept of a possible purpose, but the knowledge of the final purpose (_scopus_) of nature. But this requires a reference of such knowledge to something supersensible far transcending all our teleological knowledge of nature, for the purpose of [the existence of][109] nature must itself be sought beyond nature. The internal form of a mere blade of grass is sufficient to show that for our human faculty of judgement its origin is possible only according to the rule of purposes. But if we change our point of view and look to the use which other natural beings make of it, abandon the consideration of its internal organisation and only look to its externally purposive references, we shall arrive at no categorical purpose; all this purposive reference rests on an ever more distant condition, which, as unconditioned (the presence of a thing as final purpose), lies quite outside the physico-teleological view of the world. For example, grass is needful for the ox, which again is needful for man as a means of existence, but then we do not see why it is necessary that men should exist (a question this, which we shall not find so easy to answer if we sometimes cast our thoughts on the New Hollanders or the inhabitants of Tierra del Fuego). So conceived, the thing is not even a natural purpose, for neither it (nor its whole genus) is to be regarded as a natural product.
Hence it is only so far as matter is organised that it necessarily carries with it the concept of a natural purpose, because this its specific form is at the same time a product of nature. But this concept leads necessarily to the Idea of collective nature as a system in accordance with the rule of purposes, to which Idea all the mechanism of nature must be subordinated according to principles of Reason (at least in order to investigate natural phenomena therein). The principle of Reason belongs to it only as a subjective principle or a maxim: viz.
everything in the World is some way good for something; nothing is vain in it. By the example that nature gives us in its organic products we are justified, nay called upon, to expect of it and of its laws nothing that is not purposive on the whole.
It is plain that this is not a principle for the determinant but only for the reflective Judgement; that it is regulative and not constitutive; and that we derive from it a clue by which we consider natural things in reference to an already given ground of determination according to a new law-abiding order; and extend our natural science according to a different principle, viz. that of final causes, but yet without prejudice to the principle of mechanical causality.
Furthermore, it is in no wise thus decided, whether anything of which we judge by this principle, is a _designed_ purpose of nature; whether the grass is for the ox or the sheep, or whether these and the other things of nature are here for men. It is well also from this side to consider the things which are unpleasant to us and are contrary to purpose in particular references. Thus, for example, we can say: The vermin that torment men in their clothes, their hair, or their beds, may be, according to a wise appointment of nature, a motive to cleanliness which is in itself an important means for the preservation of health. Or again the mosquitoes and other stinging insects that make the wildernesses of America so oppressive to the savages, may be so many goads to activity for these primitive men, [inducing them] to drain the marshes and bring light into the forests which intercept every breath of air, and in this way, as well as by cultivating the soil, to make their habitations more healthy. The same thing, which appears to men contradictory to nature in its inner organisation, if viewed in this light gives an entertaining, sometimes an instructive, outlook into a teleological order of things, to which, without such a principle, mere physical observation would not lead us by itself.
Thus some persons regard the tapeworm as given to the men or animals in whom it resides, as a kind of set-off for some defect in their vital organs; now I would ask if dreams (without which we never sleep, though we seldom remember them) may not be a purposive ordinance of nature? For during the relaxation of all the moving powers of the body, they serve to excite internally the vital organs by the medium of the Imagination and its great activity (which in this state generally rises to the height of affection). During sleep the Imagination commonly is more actively at play when the stomach is overloaded, in which case this excitement is the more necessary. Consequently, then, without this internal power of motion and this fatiguing unrest, on account of which we complain about our dreams (though in fact they are rather remedial), sleep even in a sound state of health would be a complete extinction of life.
Also the beauty of nature, _i.e._ its connexion with the free play of our cognitive faculties in apprehending and judging of its appearance, can be regarded as a kind of objective purposiveness of nature in its whole [content] as a system of which man is a member; if once the teleological judging of the same by means of the natural purposes which organised beings suggest to us, has justified for us the Idea of a great system of purposes of nature. We can regard it as a favour[110] which nature has felt for us, that in addition to what is useful it has so profusely dispensed beauty and charm; and we can therefore love it, as well as regard it with respect on account of its immensity, and feel ourselves ennobled by such regard; just as if nature had established and adorned its splendid theatre precisely with this view.
We shall say only one thing more in this paragraph. If we have once discovered in nature a faculty of bringing forth products that can only be thought by us in accordance with the concept of final causes, we go further still. We venture to judge that things belong to a system of purposes, which yet do not (either in themselves or in their purposive relations) necessitate our seeking for any principle of their possibility beyond the mechanism of causes working blindly. For the first Idea, as concerns its ground, already brings us beyond the world of sense; since the unity of the supersensible principle must be regarded as valid in this way not merely for certain species of natural beings, but for the whole of nature as a system.
§ 68. _Of the principle of Teleology as internal principle of natural science_ The principles of a science are either internal to it and are then called domestic (_principia domestica_), or are based on concepts that can only find their place outside it and so are _foreign_ principles (_peregrina_). Sciences that contain the latter, place at the basis of their doctrines auxiliary propositions (_lemmata_), _i.e._ they borrow some concept, and with it a ground of arrangement, from another science.
Every science is in itself a system, and it is not enough in it to build in accordance with principles and thus to employ a technical procedure, but we must go to work with it architectonically, as a building subsisting for itself; we must not treat it as an additional wing or part of another building, but as a whole in itself, although we may subsequently make a passage from it into that other or conversely.
If then we introduce into the context of natural science the concept of God in order to explain the purposiveness in nature, and subsequently use this purposiveness to prove that there is a God, there is no internal consistency in either science [_i.e._ either in natural science or theology]; and a delusive circle brings them both into uncertainty, because they have allowed their boundaries to overlap.
The expression, a purpose of nature, already sufficiently prevents the confusion of mixing up natural science and the occasion that it gives for judging _teleologically_ of its objects, with the consideration of God, and so of a _theological_ derivation of them. We must not regard it as insignificant, if one interchanges this expression with that of a divine purpose in the ordering of nature, or gives out the latter as more suitable and proper for a pious soul, because it must come in the end to deriving these purposive forms in nature from a wise author of the world. On the contrary, we must carefully and modestly limit ourselves to the expression, a purpose of nature, which asserts exactly as much as we know. Before we ask after the cause of nature itself, we find in nature, and in the course of its development, products of the same kind which are developed in it according to known empirical laws, in accordance with which natural science must judge of its objects, and, consequently, must seek in nature their causality according to the rule of purposes. So then it must not transgress its bounds in order to introduce into itself as a domestic principle that, to whose concept no experience can be commensurate, upon which we are only entitled to venture after the completion of natural science.
Natural characteristics which demonstrate themselves _a priori_, and consequently admit of insight into their possibility from universal principles without any admixture of experience, although they carry with them a technical purposiveness, yet cannot, because they are absolutely necessary, be referred to the Teleology of nature, as to a method belonging to Physic for solving its problems. Arithmetical or geometrical analogies, as well as universal mechanical laws,--however strange and admirable may seem to us the union of different rules, quite independent of one another according to all appearance, in a single principle,--possess on that account no claim to be teleological grounds of explanation in Physic. Even if they deserve to be brought into consideration in the universal theory of the purposiveness