Of the various systems of sociology that have been developed since the new "science" was first outlined by Auguste Comte, that of Herbert Spencer is undoubtedly the most coherent and self-consistent. But even the genius of Mr. Spencer has been unequal to the task of working out a body of firmly grounded principles which should furnish a basis for the convergence of opinion on social questions. He has not succeeded in giving permanent form and content to sociology. His work is disparagingly criticised by other living sociologists. Small declares that "Spencer's sociology ends precisely where sociology proper should begin," and quotes approvingly De Greef's assertion that "Mr. Spencer not only fails to show that there is a place for sociology, but his own reasoning proves more than anything else that there is no social science superior to biology."[37] Ward, while commending the logical consistency of Mr. Spencer's work, pronounces him "unsystematic, nonconstructive, and nonprogressive."[38]

There is much justice in these criticisms of Mr. Spencer's system. His sociology is almost entirely descriptive; and his description of social phenomena has taken the form of an elaborate analogy between society and the animal organism. The utility of this biological analogy has rightly been called in question. The particular resemblances traced by Mr. Spencer between a society and a living body are these: both grow and increase in size; while they increase in size they increase in structure; increase in structure is accompanied by progressive differentiation of functions; and differentiation of functions leads to mutual interdependence of the parts. Furthermore, in the case both of a society and of a living body the lives of the units continue for some time if the life of the aggregate is suddenly arrested; while if the aggregate is not suddenly destroyed by violence its life greatly exceeds in duration the lives of its units. Since, therefore, the permanent relations among the parts of a society are analogous to the permanent relations among the parts of an organism, society is to be regarded as an organism.

Now the trouble with this clever analogy is that it breaks down completely when the comparison is carried beyond a certain point. Mr. Spencer himself notices some differences between the social body and the animal body, but declares that they are not of such fundamental character as to weaken the force of his analogy. One of these differences, however, can not be so lightly dismissed. If we compare a high type of animal organism with a high type of society, this striking unlikeness is discovered. In the former there is but one center of consciousness; in the latter there are many. "In the one," to quote Mr. Spencer's own words, "consciousness is concentrated in a small part of the aggregate. In the other it is diffused throughout the aggregate." The animal body has one brain, one center of thought, feeling, and life; the social body has numberless such centers.

When we go back and compare the course of development in the two cases the difference noted comes into even greater prominence. The evolution of animal life is characterized by progressive centralization, the evolution of social life by progressive decentralization. In the lowest form of animal, the amœba, there is no single center of life. The life is in all the parts; reproduction takes place simply by division. But with each successive advance above this lowest form there is developed more and more definitely a single center of consciousness. One part becomes distinctly differentiated as the sole seat of life. If that part is destroyed, the organism dies. Thus, "animal development has meant a concentration of the more important nervous elements and a merging of their separate activity in the common activity of a single consciousness."[39]

The law of progress is quite the reverse in social development. At a primitive stage there is a marked subjection of the individual elements of society to a central authority, whether that of the patriarch, the tribal head, or the tribal assembly. The individual has no economic, legal, or moral independence. But as society develops, the control which the whole exerts over the parts through authority and custom is gradually diminished. The individuality of the members of the social body becomes more and more marked. Individual freedom and responsibility are definitely recognized. Thus, the development of society has meant "the development of individuality in each of its members." It is a development of persons; the "social consciousness exists only in the discrete social elements which have become individual."[40]

In a word, social evolution is accompanied by a growing individualization of the component elements of society, whereas animal development leads to ever-stronger concentration of the life of the organism in a single part.

This difference between the physical organism and society is fundamental and essential. It is far more striking than the superficial likenesses ingeniously adduced by Mr. Spencer. His analogy tends to obscure the real nature of social relations. Unless used with cautious qualifications it "suggests false and one-sided views" and thus hinders the progress of sociology. The biological analogy has, it may be conceded, a certain value as a convenient way of describing some of the aspects of social structure and growth. It may aid the student to comprehend certain facts, but, if followed blindly, it will lead him to overlook other facts of even greater importance.

The biological analogy has been carried to absurd lengths by some writers. There is wearisome enumeration of social aggregates and organs, and exhaustive description of the social nervous system. We learn that the individual may be either a communicating cell or a terminal cell, otherwise known as an end organ. The girl in the central telephone office acts as a communicating cell when she telephones to Mr. Smith a message from Mr. Brown. "But when, Mr. Smith having asked her the exact time by the chronometer in the exchange, she looks at the dial and reports her observation to him, she is primarily a terminal cell or end organ."[41] The lookout man at sea, on the other hand, is invariably an end organ. This is far-fetched and fanciful. To clothe mere commonplaces in the borrowed rags and tags of biological terminology is not social science, nor does it aid one to get a correct conception of social reality.

The unsettled state of sociological thought which has been here set forth is a natural result of the peculiar difficulties that stand in the way of the social sciences. These have been described by Mr. Spencer with great fullness of illustration.[42] They arise from three sources—namely, (1) from the intrinsic nature of the facts dealt with; (2) from the natures of the observers of these facts; and (3) from the peculiar relation in which the observers stand toward the facts observed.

1. In the first place the peculiar nature of social phenomena is such as to render scientific observation difficult. They are not of a directly perceptible kind like the phenomena which form the subject-matter of the natural sciences. Quantitative measurement and experiment are not possible. Social facts "have to be established by putting together many details, no one of which is simple, and which are dispersed, both in space and time, in ways that make them difficult of access."