Every science begins by accumulating observations, and presently generalizes these empirically, but only when it reaches the stage at which its empirical generalizations are included in a rational generalization, does it become developed science. So with Ethics; a preparation in the simpler sciences is presupposed. It has a biological aspect; since it concerns certain effects, inner and outer, individual and social, of the vital changes going on in the highest type of animals. It has a psychological aspect; for its subject-matter is an aggregate of actions that are prompted by feelings and guided by intelligence. And it has a sociological aspect; for these actions, some of them directly, and all of them indirectly, affect associated beings. Belonging under one aspect of each of these sciences,--physical, biological, psychological, sociological,--it can find its ultimate interpretations only in those fundamental truths which are common to all of them, as different aspects of evolving life. THE PHYSICAL VIEW While an aggregate evolves, not only the matter composing it, but also the motion of that matter, passes from an indefinite, incoherent homogeneity to a definite, coherent, heterogeneity. It is so with conduct. The conduct of lowly organized creatures has its successive portions feebly connected. From these up to man may be observed an increase in cohesion. Man, even in his lowest state, displays in his conduct far more coherent combinations of motions; and in civilized man this trait of developed conduct becomes more conspicuous still. But an even greater coherence among its component motions broadly distinguishes the conduct we call moral from the conduct we call immoral. The application of the word dissolute to the last, and of the word self-restrained to the first, implies this fact. The sequences of conduct in the moral man are more easily to be specified, as implied by the word trustworthy applied to them; while those of the less principled man cannot be so specified; as is implied by the word untrustworthy. Indefiniteness accompanies incoherence in conduct that is little evolved; and throughout the ascending stages of evolving conduct there is an increasingly definite cooerdination of the motions constituting it, until we reach the conscientious man, who is exact in all his transactions. With this increase of definiteness and coherence goes also an increase of heterogeneity; the moral man performs more varied duties, adjustments of acts to ends in more varied relations, than does the immoral man. Evolution in conduct is, like all other evolution, towards equilibrium,--not the equilibrium reached by the individual in death, but a moving equilibrium. His evolution consists in a continual adjustment of inner to outer relations, until a state of society shall be reached in which the individual will find his nature congruous with the environment. THE BIOLOGICAL VIEW