A medical professor analyzes how biological and medical perspectives permeate Paul Bourget's fiction, arguing that the physician should be seen as a biologist of human life who links moral and physical dimensions. The essay surveys recurring doctor types—family practitioner, fashionable clinician, cynical materialist and others—and examines motifs of heredity, hygiene, nervous disorders, diagnostic observation and social function, showing how medical thought shapes character portrayal, social critique and moral psychology throughout the novels.