The Organon developed slowly out of Hahnemanns research and experimentation over a period of time. It underwent as many as six editions. This sixth edition incorporates the latest findings of Dr Hahnemann during his dying years and deemed to be the most perfect of all. Many newer concepts like replacement of the vital force by vital principle, the 50 millesimal scale of potency and permissibility of external applications were introduced for the first time that were unheard of in the other editions. The work is a result of the untiring efforts of the master to improve and update his work and is of historical importance as far as medical philosophy is concerned. High on philosophy, Footnotes explaining difficult concepts, Evolution of medical science reinstated.