The Law of Similars: A Philosophical Re-examination of Hahnemann's Organon §§ 25–29

The principle of similia similibus curentur — let likes be cured by likes — is the cornerstone upon which Hahnemann erected the entire edifice of homoeopathic therapeutics. Yet the precise philosophical grounding of this principle, as articulated across the successive editions of the Organon, has been the subject of considerable scholarly debate.

In §26 of the fifth and sixth editions, Hahnemann states: This depends on the following homoeopathic law of nature which was sometimes, indeed, vaguely surmised but not hitherto fully recognised, and to which is due every genuine cure that has ever taken place. The deliberate use of the phrase 'law of nature' signals his intent to place homoeopathy on equal epistemological footing with established natural philosophy.

Our analysis traces the evolution of this argument across all six editions, identifying significant conceptual refinements that have often been obscured by conflation of editions in secondary literature.