This permanent supremacy of egoism over altruism, made manifest by contemplating existing life, is further made manifest by contemplating life in course of evolution. § 69. Those who have followed with assent the recent course of thought, do not need telling that throughout past eras, the life, vast in amount and varied in kind, which has overspread the earth, has progressed in subordination to the law that every individual shall gain by whatever aptitude it has for fulfilling the conditions to its existence. The uniform principle has been that better adaptation shall bring greater benefit; which greater benefit, while increasing the prosperity of the better adapted, shall increase also its ability to leave offspring inheriting more or less its better adaptation. And, by implication, the uniform principle has been that the ill-adapted, disadvantaged in the struggle for existence, shall bear the consequent evils: either disappearing when its imperfections are extreme, or else rearing fewer offspring, which, inheriting its imperfections, tend to dwindle away in posterity. It has been thus with innate superiorities; it has been thus also with acquired ones. All along the law has been that increased function brings increased power; and that therefore such extra activities as aid welfare in any member of a race, produce in its structures greater ability to carry on such extra activities: the derived advantages being enjoyed by it to the heightening and lengthening of its life. Conversely, as lessened function ends in lessened structure, the dwindling of unused faculties has ever entailed loss of power to achieve the correlative ends: the result of inadequate fulfillment of the ends being diminished ability to maintain life. And by inheritance, such functionally produced modifications have respectively furthered or hindered survival in posterity. As already said, the law that each creature shall take the benefits and the evils of its nature, be they those derived from ancestry or those due to self-produced modifications, has been the law under which life has evolved thus far; and it must continue to be the law however much further life may evolve. Whatever qualifications this natural course of action may now or hereafter undergo, are qualifications that cannot, without fatal results, essentially change it. Any arrangements which in a considerable degree prevent superiority from profiting by the rewards of superiority, or shield inferiority from the evils it entails--any arrangements which tend to make it as well to be inferior as to be superior, are arrangements diametrically opposed to the progress of organization and the reaching of a higher life. But to say that each individual shall reap the benefits brought to him by his own powers, inherited and acquired, is to enunciate egoism as an ultimate principle of conduct. It is to say that egoistic claims must take precedence of altruistic claims.