I suppose, then, a force which combines in certain proportions the elements of wealth, and makes of them a homogeneous whole: if the constituent elements do not exist in the desired proportion, the combination will take place nevertheless; but, instead of absorbing all the material, it will reject a portion as useless. The internal movement by which the combination is produced, and which the affinities of the various substances determine--this movement in society is exchange; exchange considered no longer simply in its elementary form and between man and man, but exchange considered as the fusion of all values produced by private industry in one and the same mass of social wealth. Finally, the proportion in which each element enters into the compound is what we call value; the excess remaining after the combination is NON-VALUE, until the addition of a certain quantity of other elements causes further combination and exchange. We will explain later the function of money. This determined, it is conceivable that at a given moment the proportions of values constituting the wealth of a country may be determined, or at least empirically approximated, by means of statistics and inventories, in nearly the same way that the chemists have discovered by experience, aided by analysis, the proportions of hydrogen and oxygen necessary to the formation of water. There is nothing objectionable in this method of determining values; it is, after all, only a matter of accounts. But such a work, however interesting it might be, would teach us nothing very useful. On the one hand, indeed, we know that the proportion continually varies; on the other, it is clear that from a statement of the public wealth giving the proportions of values only for the time and place when and where the statistics should be gathered we could not deduce the law of proportionality of wealth. For that, a single operation of this sort would not be sufficient; thousands and millions of similar ones would be necessary, even admitting the method to be worthy of confidence. Now, here there is a difference between economic science and chemistry. The chemists, who have discovered by experience such beautiful proportions, know no more of their how or why than of the force which governs them. Social economy, on the contrary, to which no a posteriori investigation could reveal directly the law of proportionality of values, can grasp it in the very force which produces it, and which it is time to announce.