against it, and to free ourselves from some of these essential ideas, we meet with great resistances. They do not merely depend upon us, but they impose themselves upon us. Now empirical data present characteristics which are diametrically opposed to these. A sensation or an image always relies upon a determined object, or upon a collection of objects of the same sort, and expresses the momentary condition of a particular consciousness; it is essentially individual and subjective. We therefore have considerable liberty in dealing with the representations of such an origin. It is true that when our sensations are actual, they impose themselves upon us in fact. But by right we are free to conceive them otherwise than they really are, or to represent them to ourselves as occurring in a different order from that where they are really produced. In regard to them nothing is forced upon us except as considerations of another sort intervene. Thus we find that we have here two sorts of knowledge, which are like the two opposite poles of the intelligence. Under these conditions forcing reason back upon experience causes it to disappear, for it is equivalent to reducing the universality and necessity which characterize it to pure appearance, to an illusion which may be useful practically, but which corresponds to nothing in reality; consequently it is denying all objective reality to the logical life, whose regulation and organization is the function of the categories. Classical empiricism results in irrationalism; perhaps it would even be fitting to designate it by this latter name.
In spite of the sense ordinarily attached to the name, the apriorists have more respect for the facts. Since they do not admit it as a truth established by evidence that the categories are made up of the same elements as our sensual representations, they are not obliged to impoverish them systematically, to draw from them all their real content, and to reduce them to nothing more than verbal artifices. On the contrary, they leave them all their specific characteristics. The apriorists are the rationalists; they believe that the world has a logical aspect which the reason expresses excellently. But for all that, it is necessary for them to give the mind a certain power of transcending experience and of adding to that which is given to it directly; and of this singular power they give neither explanation nor justification. For it is no explanation to say that it is inherent in the nature of the human intellect. It is necessary to show whence we hold this surprising prerogative and how it comes that we can see certain relations in things which the examination of these things cannot reveal to us. Saying that only on this condition is experience itself possible changes the problem perhaps, but does not answer it. For the real question is to know how it comes that experience is not sufficient unto itself, but presupposes certain conditions which are exterior and prior to it, and how it happens that these conditions are realized at the moment and in the manner that is desirable. To answer these questions it has sometimes been assumed that above the reason of individuals there is a superior and perfect reason from which the others emanate and from which they get this marvellous power of theirs, by a sort of mystic participation: this is the divine reason. But this hypothesis has at least the one grave disadvantage of being deprived of all experimental control; thus it does not satisfy the conditions demanded of a scientific hypothesis. More than that, the categories of human thought are never fixed in any one definite form; they are made, unmade and remade incessantly; they change with places and times. On the other hand, the divine reason is immutable. How can this immutability give rise to this incessant variability?
Such are the two conceptions that have been pitted against each other for centuries; and if this debate seems to be eternal, it is because the arguments given are really about equivalent. If reason is only a form of individual experience, it no longer exists. On the other hand, if the powers which it has are recognized but not accounted for, it seems to be set outside the confines of nature and science. In the face of these two opposed objections the mind remains uncertain. But if the social origin of the categories is admitted, a new attitude becomes possible, which we believe will enable us to escape both of the opposed difficulties.
The fundamental proposition of the apriorist theory is that knowledge is made up of two sorts of elements, which cannot be reduced into one another, and which are like two distinct layers superimposed one upon the other.16 Our hypothesis keeps this principle intact. In fact, that knowledge which is called empirical, the only knowledge of which the theorists of empiricism have made use in constructing the reason, is that which is brought into our minds by the direct action of objects. It is composed of individual states which are completely explained17 by the psychical nature of the individual. If, on the other hand, the categories are, as we believe they are, essentially collective representations, before all else, they should show the mental states of the group; they should depend upon the way in which this is founded and organized, upon its morphology, upon its religious, moral and economic institutions, etc. So between these two sorts of representations there is all the difference which exists between the individual and the social, and one can no more derive the second from the first than he can deduce society from the individual, the whole from the part, the complex from the simple.18 Society is a reality sui generis; it has its own peculiar characteristics, which are not found elsewhere and which are not met with again in the same form in all the rest of the universe. The representations which express it have a wholly different contents from purely individual ones and we may rest assured in advance that the first add something to the second.
Even the manner in which the two are formed results in differentiating them. Collective representations are the result of an immense co-operation, which stretches out not only into space but into time as well; to make them, a multitude of minds have associated, united and combined their ideas and sentiments; for them, long generations have accumulated their experience and their knowledge. A special intellectual activity is therefore concentrated in them which is infinitely richer and complexer than that of the individual. From that one can understand how the reason has been able to go beyond the limits of empirical knowledge. It does not owe this to any vague mysterious virtue but simply to the fact that according to the well-known formula, man is double. There are two beings in him: an individual being which has its foundation in the organism and the circle of whose activities is therefore strictly limited, and a social being which represents the highest reality in the intellectual and moral order that we can know by observation — I mean society. This duality of our nature has as its consequence in the practical order, the irreducibility of a moral ideal to a utilitarian motive, and in the order of thought, the irreducibility of reason to individual experience. In so far as he belongs to society, the individual transcends himself, both when he thinks and when he acts.
This same social character leads to an understanding of the origin of the necessity of the categories. It is said that an idea is necessary when it imposes itself upon the mind by some sort of virtue of its own, without being accompanied by any proof. It contains within it something which constrains the intelligence and which leads to its acceptance without preliminary examination. The apriorist postulates this singular quality, but does not account for it; for saying that the categories are necessary because they are indispensable to the functioning of the intellect is simply repeating that they are necessary. But if they really have the origin which we attribute to them, their ascendancy no longer has anything surprising in it. They represent the most general relations which exist between things; surpassing all our other ideas in extension, they dominate all the details of our intellectual life. If men did not agree upon these essential ideas at every moment, if they did not have the same conception of time, space, cause, number, etc., all contact between their minds would be impossible, and with that, all life together. Thus society could not abandon the categories to the free choice of the individual without abandoning itself. If it is to live there is not merely need of a satisfactory moral conformity, but also there is a minimum of logical conformity beyond which it cannot safely go. For this reason it uses all its authority upon its members to forestall such dissidences. Does a mind ostensibly free itself from these forms of thought? It is no longer considered a human mind in the full sense of the word, and is treated accordingly. That is why we feel that we are no longer completely free and that something resists, both within and outside ourselves, when we attempt to rid ourselves of these fundamental notions, even in our own conscience. Outside of us there is public opinion which judges us; but more than that, since society is also represented