An organ or instrument; hence, a method by which philosophical or scientific investigation may be conducted; -- a term adopted from the Aristotelian writers by Lord Bacon, as the title ("Novum Organon") of part of his treatise on philosophical method.

The Organon of Medicine is the title of Samuel Hahnemann's book outlining the principles of homeopathy. Hahneman was the “discoverer” of modern homeopathy and his book was written in six additions over a thirty two year period. The final addition was finished in 1842.

a system of principles for philosophic or scientific investigations; an instrument for acquiring knowledge

The Organon of Medicine, by Samuel Hahnemann, MD, founder of homeopathy. This book describes the principles and practice of homeopathy. Six editions appeared from 1810-1842. The sixth edition was published in 1921.