Morals and the Evolution of Man

The text examines morality as a natural phenomenon shaped by biological instincts, psychological inhibition, and social sanctions. It opens with animal experiments illustrating how restraint becomes learned, then surveys philosophical theories—hedonism, utilitarianism, and duty—arguing they converge toward pleasure-based explanations. It develops a biological account of moral sentiment, traces connections between moral norms and legal rules, and contrasts individual conscience with collective immorality. Later chapters consider freedom, responsibility, social progress, and the emotional and institutional sanctions that sustain ethical behavior, aiming to relate moral concepts to human evolution and social life.