The making of tools, implements, and fabrics is at first carried on solely by individuals working alone, but at length, machinery comes into use, the elements are used as driving power, and manufacturing establishments arise having a complicated organization. The division of labor has been all the time becoming more complete, till now a single workman manages but a part of the process of making an implement or a fabric, which must pass through many hands in succession before it is completed. All are familiar with this fact. It is exactly analogous to that which we observe in the animal economy. Low in the zoological scale, one membrane performs all the organic functions; higher in the scale, there are different organs to perform the distinct functions. When the stomach and liver first appear, they are very simple in structure, and as simple in function; it is just so with the manufactories in the industrial organism. But the stomach and liver become more complicated as the scale rises; it is just so with the manufactories as civilization advances. Animals lowest in the scale have no heart--no circulation. It is just so with society--if society it may be called--which is lowest in the scale; it has no exchange of products--no commercial circulation. The parallelism is complete. Further, as already specified, we find in the animal organism, that the dependence of parts and functions upon each other becomes greater with the increase of complexity; that unitization at the top of the scale, in the midst of an almost infinite complication of organic structures and functions, has a completeness and significance which it cannot have in the simple organism at the bottom of the scale. The same precisely is true of the social organism. At the bottom of the scale, there is no dependence of one part on another--no cooeperation--no proper unity--nothing but simple individual life. Higher in the scale, there is dependence of one element of society on another; there must be cooeperation, combination, organization, a tendency, at least, toward unity.