<Table> <Tr> <Td> </Td> <Td> This article uncritically uses texts from within a religion or faith system without referring to secondary sources that critically analyze them . Please help improve this article by adding references to reliable secondary sources, with multiple points of view . (September 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article uncritically uses texts from within a religion or faith system without referring to secondary sources that critically analyze them . Please help improve this article by adding references to reliable secondary sources, with multiple points of view . (September 2016) (Learn how and when to remove this template message) </Td> </Tr> <P> Homeopathic Materia Medica are encyclopedia of therapeutic properties of each drug . These properties are ascertained through provings also known as Homeopathic pathogenetic trials (HPT). As per Samuel Hahnemann in his Organon of medicine § 143, homeopathic materia medica is "a collection of real, pure, reliable modes of action of simple medicinal substances, a volume of book of nature" They thus constitute a homeopathic prescribing reference guide and sources for compiling Homeopathic repertory . Earlier materia medicas have details regarding the materials and methods which may be used to prepare homeopathic medicines . </P> <P> Samuel Hahnemann invented the practise of homeopathy while translating the botanical, Treatise of the materia medica by the Scottish physician William Cullen from English into German in 1790 . Twenty pages in that work are devoted to Peruvian cinchona bark which is used to prepare the medicine quinine . This substance produces fever - like symptoms while being used to cure intermittent fever or ague and this led Hahnemann to conceive the principle of similars: that like may cure like . He went on to develop the materia medica along these homeopathic lines and others then continued this work to produce great volumes of potential ingredients . </P>

What are the sources of homoeopathic materia medica