Tarde's theory of transmission by imitation may be regarded, in some sense, as complementary, if not supplementary, to Wundt's theory of origins, since he puts the emphasis on the fact of transmission rather than upon genesis. In a paper, "Tendencies in Comparative Philology," read at the Congress of Arts and Sciences at the St. Louis Exposition in 1904, Professor Hanns Oertel, of Yale University, refers to Tarde's theory of imitation as an alternative explanation to that offered by Wundt for "the striking uniformity of sound changes" which students of language have discovered in the course of their investigation of phonetic changes in widely different forms of speech.
It seems hard to maintain that the change in a syntactical construction or in the meaning of a word owes its universality to a simultaneous and independent primary change in all the members of a speech-community. By adopting the theory of imitative spread, all linguistic changes may be viewed as one homogeneous whole. In the second place, the latter view seems to bring linguistic changes into line with the other social changes, such as modifications in institutions, beliefs, and customs. For is it not an essential characteristic of a social group that its members are not co-operative in the sense that each member actively participates in the production of every single element which goes to make up either language, or belief, or customs? Distinguishing thus between primary and secondary changes and between the origin of a change and its spread, it behooves us to examine carefully into the causes which make the members of a social unit, either consciously or unconsciously, willing to accept the innovation. What is it that determines acceptance or rejection of a particular change? What limits one change to a small area, while it extends the area of another? Before a final decision can be reached in favor of the second theory of imitative spread it will be necessary to follow out in minute detail the mechanism of this process in a number of concrete instances; in other words to fill out the picture of which Tarde (Les lois de l'imitation) sketched the bare outlines. If his assumptions prove true, then we should have here a uniformity resting upon other causes than the physical uniformity that appears in the objects with which the natural sciences deal. It would enable us to establish a second group of uniform phenomena which is psycho-physical in its character and rests upon the basis of social suggestion. The uniformities in speech, belief, and institutions would belong to this second group.[23]
What is true of the comparative study of languages is true in every other field in which a comparative study of cultural materials has been made. As soon as these materials are studied from the point of view of their similarities rather than from the point of view of their historical connections, problems arise which can only be explained by the more abstract sciences of psychology or sociology. Freeman begins his lectures on Comparative Politics with the statement that "the comparative method of study has been the greatest intellectual achievement of our time. It has carried light and order into whole branches of human knowledge which before were shrouded in darkness and confusion. It has brought a line of argument which reaches moral certainty into a region which before was given over to random guess-work. Into matters which are for the most part incapable of strictly external proof it has brought a form of strictly internal proof which is more convincing, more unerring."
Wherever the historian supplements external by internal proof, he is in a way to substitute a sociological explanation for historical interpretation. It is the very essence of the sociological method to be comparative. When, therefore, Freeman uses, in speaking of comparative politics, the following language he is speaking in sociological rather than historical terms:
For the purposes then of the study of Comparative Politics, a political constitution is a specimen to be studied, classified, and labelled, as a building or an animal is studied, classified, and labelled by those to whom buildings or animals are objects of study. We have to note the likenesses, striking and unexpected as those likenesses often are, between the political constitutions of remote times and places; and we have, as far as we can, to classify our specimens according to the probable causes of those likenesses.[24]
Historically sociology has had its origin in history. It owes its existence as a science to the attempt to apply exact methods to the explanation of historical facts. In the attempt to achieve this, however, it has become something quite different from history. It has become like psychology with which it is most intimately related, a natural and relatively abstract science, and auxiliary to the study of history, but not a substitute for it. The whole matter may be summed up in this general statement: history interprets, natural science explains. It is upon the interpretation of the facts of experience that we formulate our creeds and found our faiths. Our explanations of phenomena, on the other hand, are the basis for technique and practical devices for controlling nature and human nature, man and the physical world.
V. THE SOCIAL ORGANISM: HUMANITY OR LEVIATHAN?
After Comte the first great name in the history of sociology is Spencer. It is evident in comparing the writings of these two men that, in crossing the English Channel, sociology has suffered a sea change. In spite of certain similarities in their points of view there are profound and interesting differences. These differences exhibit themselves in the different ways in which they use the term "social organism."
Comte calls society a "collective organism" and insists, as Spencer does, upon the difference between an organism like a family, which is made up of independent individuals, and an organism like a plant or an animal, which is a physiological unit in which the different organs are neither free nor conscious. But Spencer, if he points out the differences between the social and the biological organisms, is interested in the analogy. Comte, on the other hand, while he recognizes the analogy, feels it important to emphasize the distinctions.
Society for Comte is not, as Lévy-Bruhl puts it, "a polyp." It has not even the characteristics of an animal colony in which the individuals are physically bound together, though physiologically independent. On the contrary, "this 'immense organism' is especially distinguished from other beings in that it is made up of separable elements of which each one can feel its own co-operation, can will it, or even withhold it, so long as it remains a direct one."[25]