Homoeopathy is a system of drug therapy, a set of rules governing the administration of drugs to sick people. These rules enable the physician to understand the patients illness and to prescribe the drug which will act curatively. The homoeopathic rules were developed by following procedures of scientific method, and homoeopathy is, therefore, a scientific form of drug therapeutics. Since a scientific truth is universal, homoeopathy claims universality for its rules of drug use and, except in comparatively few instances, does not view the prescription of drugs on other principles as beneficial to the patient. This essay sets forth the homoeopathic rules and indicates why they are scientific, why homoeopathic medicine is “scientific medicine.” An exposition of these rules necessarily involves reference to the prevailing orthodox system of medical practice (which in the homoeopathic literature is called “allopathy”), ans we will proceed essentially by way of a contrast between the homoeopathic rules and principles and those accepted in the allopathic practice of medicine.