Robert Louis Stevenson published Strange Case of Dr Jekyll and Mr Hyde in 1886 and gave Victorian England its most disturbing mirror. Dr. Jekyll is a respected physician, a charitable man, a pillar of his community. He is also, privately, a person with desires that his public identity cannot accommodate, and his response is not to suppress those desires but to create a separate body in which to indulge them. Mr. Hyde is not a disease. He is a solution, a chemical creation that allows Jekyll to do what he wants without damaging the reputation of the man who wants it.

Dr. Stephen Arata of the University of Virginia, in his study of Victorian duality and degeneration, has argued that Jekyll and Hyde is the foundational text of modern identity anxiety, the first major work to propose that the self is not unified but divided, and that the division can be made literal. Stevenson was writing in an era that demanded absolute moral consistency in public life while acknowledging, privately, that nobody achieves it. Jekyll's experiment is an attempt to resolve the hypocrisy by separating the hypocrite into his components.

The Pleasure That Grows Teeth

Hyde begins as liberation. Jekyll describes the first transformation as a feeling of freedom, of youth, of possibility. He is smaller than Jekyll, younger, lighter. He moves through London without the weight of reputation, and the pleasures he pursues are initially vague, described by Stevenson as undignified rather than criminal. But Hyde grows. Each transformation makes him stronger and Jekyll weaker. The pleasure acquires teeth, then claws, then a walking stick that beats a man to death on the street.

Stevenson understood that appetites do not stay proportional. The self that is given permission to act without consequence will escalate because the absence of consequence removes the natural braking mechanism that keeps most people within social limits. Hyde is not a different person from Jekyll. He is Jekyll without limits, and limits, it turns out, are what made Jekyll human.

The Door and the Will

The novella's final chapter is Jekyll's confession, written as Hyde closes in. Jekyll can no longer control the transformations. Hyde emerges without the potion. The separate identity has become the dominant one, and Jekyll, the original, is being consumed by his own creation. The will that Jekyll writes, leaving everything to Hyde, is the most chilling detail: the respectable man has arranged for his monstrous self to inherit his life.