So is it as we ascend from savage to civilized and from the lowest among the civilized to the highest. The rhythm of external actions required to maintain the rhythm of internal actions becomes at once more complicated and more complete, making them into a better moving equilibrium. The irregularities which their conditions of existence entail on primitive men, continually cause wide deviations from the mean state of the moving equilibrium--wide oscillations; which imply imperfection of it for the time being, and bring about its premature overthrow. In such civilized men as we call ill conducted, frequent perturbations of the moving equilibrium are caused by those excesses characterizing a career in which the periodicities are much broken; and a common result is that the rhythm of the internal actions being often deranged, the moving equilibrium, rendered by so much imperfect, is generally shortened in duration. While one in whom the internal rhythms are best maintained is one by whom the external actions required to fulfill all needs and duties, severally performed on the recurring occasions, conduce to a moving equilibrium that is at once involved and prolonged. Of course the implication is that the man who thus reaches the limit of evolution, exists in a society congruous with his nature, is a man among men similarly constituted, who are severally in harmony with that social environment which they have formed. This is, indeed, the only possibility. For the production of the highest type of man can go on only _pari passu_ with the production of the highest type of society. The implied conditions are those before described as accompanying the most evolved conduct--conditions under which each can fulfill all his needs and rear the due number of progeny, not only without hindering others from doing the like, but while aiding them in doing the like. And evidently, considered under its physical aspect, the conduct of the individual so constituted, and associated with like individuals, is one in which all the actions, that is the combined motions of all kinds, have become such as duly to meet every daily process, every ordinary occurrence, and every contingency in his environment. Complete life in a complete society is but another name for complete equilibrium between the co-ordinated activities of each social unit and those of the aggregate of units. § 29. Even to readers of preceding volumes, and still more to other readers, there will seem a strangeness, or even an absurdity, in this presentation of moral conduct in physical terms. It has been needful to make it, however. If that re-distribution of matter and motion constituting evolution goes on in all aggregates, its laws must be fulfilled in the most developed being as in every other thing; and his actions, when decomposed into motions, must exemplify its laws. This we find that they do. There is an entire correspondence between moral evolution and evolution as physically defined.