Spencer found four main ways in which society resembles an organism.[XVI-5] (1) In both cases growth is attended by augmentation of mass. (2) In each instance growth is accomplished by increasing complexity of structure. (3) In the organism and in society there is an interdependence of parts. (4) The life of society, like the life of an organism, is far longer than the life of any of the units or parts. But there are ways in which society and an organism are unlike.[XVI-6] These were analyzed by Spencer and determined to be merely superficial differences. There are four of these main differences. (1) Unlike organisms, societies have no specific extensive form, such as a physical body with limbs or a face. (2) The elements of society do not form a continuous whole as in the case of an animal. The living units composing society are free, and not in contact, being more or less dispersed. (3) The parts of society are not stationary and fixed in their positions relative to the whole. (4) In an organism consciousness is concentrated in a small part of the aggregate, while in society consciousness is diffused. The alleged superficiality in this difference between society and an organism was difficult for Spencer to maintain. In discussing the organic analogy further, Spencer compared the alimentary system of an organism to the productive industries, or the sustaining system in the body politic.[XVI-7] Furthermore, there is a strong parallelism between the circulatory system of an organism and the distributing system in society with its transportation lines; but more particularly, its commercial classes and media of exchange. Then, in both cases there has developed regulating systems. In an organism there is a dominant center and subordinate centers, the senses, and a neural apparatus. A similar structure appears in society in the form of an adjustive apparatus, or government, for the purpose of adjudicating the differences between the producers and the consumers. These parallelisms throw only a small measure of light upon the nature of society. They appear ridiculous when carried to an extreme, for example, to the extreme to which Spencer himself went when he compared the King’s Council to the medulla oblongata, the House of Lords to the cerebellum, and the House of Commons to the cerebrum.