The reason is, that the most attentive observation of the facts of history has invariably demonstrated to me that social organisms being every whit as complicated as those of all beings, it is in no wise in our power to force them to undergo on a sudden far-reaching transformations. Nature has recourse at times to radical measures, but never after our fashion, which explains how it is that nothing is more fatal to a people than the mania for great reforms, however excellent these reforms may appear theoretically. They would only be useful were it possible to change instantaneously the genius of nations. This power, however, is only possessed by time. Men are ruled by ideas, sentiments, and customs--matters which are of the essence of ourselves. Institutions and laws are the outward manifestation of our character, the expression of its needs. Being its outcome, institutions and laws cannot change this character. The study of social phenomena cannot be separated from that of the peoples among whom they have come into existence. From the philosophic point of view these phenomena may have an absolute value; in practice they have only a relative value. It is necessary, in consequence, when studying a social phenomenon, to consider it successively under two very different aspects. It will then be seen that the teachings of pure reason are very often contrary to those of practical reason. There are scarcely any data, even physical, to which this distinction is not applicable. From the point of view of absolute truth a cube or a circle are invariable geometrical figures, rigorously defined by certain formulas. From the point of view of the impression they make on our eye these geometrical figures may assume very varied shapes. By perspective the cube may be transformed into a pyramid or a square, the circle into an ellipse or a straight line. Moreover, the consideration of these fictitious shapes is far more important than that of the real shapes, for it is they and they alone that we see and that can be reproduced by photography or in pictures. In certain cases there is more truth in the unreal than in the real. To present objects with their exact geometrical forms would be to distort nature and render it unrecognisable. If we imagine a world whose inhabitants could only copy or photograph objects, but were unable to touch them, it would be very difficult for such persons to attain to an exact idea of their form. Moreover, the knowledge of this form, accessible only to a small number of learned men, would present but a very minor interest. The philosopher who studies social phenomena should bear in mind that side by side with their theoretical value they possess a practical value, and that this latter, so far as the evolution of civilisation is concerned, is alone of importance. The recognition of this fact should render him very circumspect with regard to the conclusions that logic would seem at first to enforce upon him.