However, this type of method is not devoid of inconvenience in sociology. It does not consider the necessary succession of the various phases in the social evolution: it seems on the contrary to consider them all as simultaneous. Consequently, it prevents us from seeing the filiation of social forms. It also runs the risk of falsifying the analysis of the cases which are observed, and of causing simple secondary factors to be taken for main causes. This is what happened to Montesquieu who compared indifferently the cities of antiquity, the France of the Middle Ages, the England of the XVIII. century, the republic of Venice, the government of Byzantium, the Empire of the Sultan, and that of the Shah of Persia.
So the comparative method is only an auxiliary process in sociology. Like observation and experiment, it has to be made subordinate to a rational conception of the evolution of humanity. The latter in turn depends upon the use of an original method of observation, belonging to social phenomena, and free from the dangers presented by the preceding ones. This specific sociological method, this “transcendent” process, by which the positive method is completed, is, says Comte, the historical method.[244]
IV.
Sociology is an abstract science: history, which is its essential method, cannot therefore be history merely considered as a narrative. There are two ways of conceiving history, the one abstract and the other concrete. The latter dominates in the historical works written up to the present time. Their end is to relate and to array in chronological order a certain sequence of events. Undoubtedly in the XVIII. century efforts were made to co-ordinate political phenomena and to determine their filiation. But for all that this kind of work has not ceased to be descriptive and literary. The other form of history, which does not exist up to the present, has for its end the research of the laws which regulate the social development of the human species.[245]
Difference of object leads to difference of method. If an historian proposes to himself to compose exact “annals,” to relate things as they took place, he will begin by the special history of the various peoples, which, in its turn, is founded upon the chronicles of the provinces and the towns. It will be necessary for him to investigate documents in detail, and to neglect no source: the work of combination will only come subsequently. But if our end is the abstract science of history, that is to say the linking together of social phenomena, quite a different course will have to be followed. Indeed all the classes of these phenomena are simultaneously developed, and under the mutual influence of one another. We cannot explain the line of advance followed by anyone among them, without having first conceived in a general way “the progression of the whole.” Before all things then we must set ourselves to conceive the development of the human species in its widest generality, that is to say, to observe and to link together among themselves the most important steps towards progress which it has successively taken in the various fundamental directions. Then we shall subdivide the periods and the classes of the phenomena to be observed.[246]
These “various fundamental directions” correspond to what Comte called later the “social series.” By this he indicates the groups of social phenomena arranged for a scientific study. Once these groups are formed, then, according to the totality of historical facts, the sociologist seeks to determine the continuous growth of each, physical, moral, intellectual or political disposition or faculty, combined with the indefinite decrease of the opposite disposition or faculty: for instance, the tendency of human society to pass from the warlike form to the industrial form, from revealed religion to demonstrated religion, etc. From this will be drawn the scientific forecast of the triumph of the one and the fall of the other, provided that this conclusion is also in conformity with the general laws of the evolution of Humanity.
Such a forecast could never be founded upon the knowledge of the present alone. For the present exposes us to the danger of confusing the principal with the secondary facts, of “placing noisy passing demonstrations above deep-seated tendencies,” and of regarding institutions or doctrines as growing which are really on the decline. Our statesmen scarcely look back beyond the XVIII. century, our philosophers beyond the XVI. This is too little. It does not even suffice to make us understand the French revolution. The study of the “historical series” alone allows the understanding of the present and the prevision of the future. The sociologist will even exercise himself in predicting the past, that is to say, in acquiring a rational knowledge of it, and in deducing each historical situation from the whole of its antecedents. He will thus become familiar with the spirit of the historical method.
However, if this abstract historical method were used by the sociologist to the exclusion of every other, he would sometimes come to a wrong conclusion, and take the continuous decrease in a natural faculty for a tendency to total extinction. For instance, as civilisation becomes more refined, man eats less than formerly. Nobody concludes from this that he tends not to eat at all. But the absurdity which is palpable here, might, in other cases pass unperceived. That is why the historical method in sociology requires to be controlled by the positive theory of human nature. All the inductions which might contradict this theory are to be rejected. Indeed, the whole social evolution is at bottom but a simple development of humanity, without the creation of new faculties. The germ, at any rate, of all the dispositions or effective faculties which sociological observation, (and in particular, history), may make known, must then be found in the primordial type which biology has constructed beforehand for sociology. Accordance between the conclusions of historical analysis and the preliminary notions of the biological theory is the indispensable guarantee of sociological demonstrations.[247]
V.
Thus conceived the historical method rests upon the postulate given by Comte, as we have seen, as a basis to his sociology. This postulate is thus enunciated: The nature of man evolves without being transformed. The various physical, moral and intellectual faculties, must be found the same at all the degrees of historical evolution, and always similarly co-ordinated among themselves. The development which they receive in the social state can never change their nature, nor consequently destroy or create any one of them, nor even intervene in the order of their importance.