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The Law of Similars forming the basis of Homoeopathy, though finds a mention in the teachings of Hippocrates and Paracelsus, the credit of deriving an entire system of therapeutics from this principle, goes to the German physician Christian Friedrich Samuel Hahnemann.

While translating the Materia Medica [1789] of William Cullen, also called the Scottish Hippocrates, Hahnemann was intrigued by the explanation provided by Cullen about the reason why Cinchona bark was useful in intermittent fever. To understand the effects of Cinchona bark in intermittent fevers, Hahnemann experimented on his own self. Intake of Cinchona resulted in occurrence of condition simulating intermittent fevers. This effect that Cinchona bark produced on him gave birth to the novel idea of Human Provings, on which the subsequent therapeutics was based.

Hahnemann continued to experiment on himself and on others, close to him, noting that every substance he took produced definite distinct symptoms. He further noted that no two substances produced, exactly the same set of symptoms. Each substance provoked its own unique pattern of symptoms, both on physical and mental plane. At first, Hahnemann tested substances commonly used as medicines in his time (such as Antimony and Rhubarb) and also, poisons like Arsenic and Belladonna. The provings done by Hahnemann on himself and on others were recorded in his various writings from 1805 onwards. Eventually, Hahnemann began to treat the sick on the principles of Homoeopathy and achieved outstanding clinical success right from the outset.

(Gr. Homoiopatheia, from homoiopathes having like feelings or affections; hmoios, like, similar and pthos, feelings, sufferings). The theory or system of curing diseases with very minute doses of medicine which in a healthy person and in large doses would produce a condition like that of the disease treated.

Websters Dictionary

As per the primary principle of Homoeopathy, Similia Similibus Curentur or the Law of Similars which is the natural law of healing, diseases are treated by medicines, which are capable of producing in healthy persons, symptoms similar to those of the disease, which it can treat in a sick person. The term "homoeopathy" was coined by Christian Friedrich Samuel Hahnemann and first appeared in print in 1807.