In default of the powerful instrument furnished by mathematics, sociology makes use of the methods employed in the physical and natural sciences. Of these observation is the first. Social phenomena seem easy to observe, because they are very common, and the observer takes part in them more or less. But, on the contrary, these two circumstances render sociological observation very difficult. We only observe well on condition that we place ourselves outside what we observe.[241] Sociological facts ought then to appear objective to us, detached from us, independent of the state of our individual consciousness. Nothing is more difficult to realise. In order to obtain, and more especially to maintain, “such an inversion of the spontaneous point of view,” the mind must already have partly constructed what it wishes to see. Were it not already provided with a preliminary theory, for the most part the observer would not know what he must look for in the fact which is taking place under his eyes. It is therefore by the preceding facts that we learn to see the following ones. There lies “the immense difficulty” of sociology, in which we are thus obliged, in a certain measure, to determine simultaneously the facts and the laws. If we are not already possessed of the necessary speculative indications to grasp them, the facts remain barren and even unseen, although we are, so to speak, immersed in them. Consequently, a social fact can have no scientific significance if it is not brought into relation with another fact. In an isolated condition, it remains in the state of a simple anecdote, capable at most of satisfying “idle curiosity,” but unfit for any rational use. An infinite number of facts may be useful to sociology, apparently very insignificant customs, all kinds of monuments, the analysis and the comparison of languages; but the mind must be provided for their observation with general points of view. Only on this condition will a mind, well prepared by rational education, be able to transform the actions which take place beneath its eyes into sociological indications, “according to the more or less direct points of contact, which he will be able to discern in these actions with the highest notions of science, in virtue of the connexion of the various social aspects.”