Part III. of the "Principles of Ethics" is occupied with practical considerations concerning "The Ethics of Individual Life," under the headings "Activity," "Rest," "Nutrition," "Stimulation," "Culture," "Amusements," "Marriage," "Parenthood." Of the general ethical relation of the individual to society, Spencer says:--"Integration being the primary process of evolution, we may expect that the aggregate of conceptions constituting ethics enlarges at the same time that its components acquire heterogeneity, definiteness, and that kind of cohesion which system gives to them. As fulfilling this expectation, we may first note that while drawing within its range of judgment numerous actions of men towards one another which at first were not recognized as right or wrong, it finally takes into its sphere the various divisions of private conduct--those actions of each individual which directly concern himself only, and in but remote ways concern his fellows." Ethics has been commonly regarded as merely a system of interdicts on certain kinds of acts which men would like to do and of injunctions to perform certain acts which they would like not to do. It says nothing about the great mass of acts constituting normal life, though these have their ethical aspect. The pleasurable has been too often regarded as outside the legitimate sphere of ethical approval, where not directly the rightful subject of ethical disapproval. But pleasure is an accompaniment of vitality, and furthers the vital activities; and if the general happiness is to be the aim of action, then the happiness of each unit is a fit aim; and there is unquestionably "a division of ethics which yields sanction to all the normal actions of individual life, while it forbids the abnormal ones." There is an altruistic as well as an egoistic justification of the care for self, since the health of descendants and the ability to provide for offspring is directly concerned; and since such care is needful to exclude the risk of becoming a burden to others. And there is a further positive justification of egoism which results from the obligation to expend some effort for others, and to become, as far as possible, a source of social pleasure to others. It will be seen, from the above analysis, that the chapter appended to Part I. still speaks of an ultimate state of complete adjustment to social life[52]; this chapter was, however, published from the original MS. without alteration. Some passages in Part II. seem to involve the same idea of a possible complete attainment of the ethical end,[53] but Part III. closes with reference to "an approximately complete adjustment of the nature to the life which has to be led." FOOTNOTES: [38] Spencer elsewhere says "due exercise," _vide_ p. 76. [39] Essay on "Morals and Moral Sentiment." [40] P. 105. [41] _Vide_ "Principles of Psychology." [42] P. 104. [43] Pp. 104,105. [44] Pp. 108, 109. [45] Pp. 134, 148. [46] P. 147. [47] Pp. 202, 203.