His first work is the Organon, where he explained the theory of homeopathy. In it he explains the Law of similars and how to work with in practice.
In Chronic Diseases he expanded the Materia medica. In the introduction he developed the theory of chronic diseases and the miasms. The miasm is a concept that shows that what normally is seen as disease is just an expression of something behind all those expressions.
There he also explained what has become known as the Laws of Hering, which are principles of evaluation the development of health.
A short biography of Dr Samuel Hahnemann.
Samuel Hahnemann was a doctor and medical reformer who lived from 1755-1843. He was a genius who at twelve tutored his classmates to pay for his schooling. Likewise as a medical student, he paid his college fees by translating medical, chemistry and botany works from numerous languages into German while studying medicine. He was a great linguist. He was also a respected chemist and as a pharmacist introduced procedures still in use today.
As a doctor he was the first of the modern psychiatrists. Along with Pinel in France (1792) he was the first to promote the humane treatment of mentally ill patients in addition to curing them. So much so that Duke Ernst of Gotha (Germany) gave a wing of his castle to Hahnemann for use as the first real asylum for the mentally ill.
Fifty years before Koch and Pasteur turned up with the newly invented microscope, Hahnemann had understood and described contagious disease and successfully treated epidemics of typhus, scarlet fever and cholera in Europe.
He understood the mind-body connection 200 years before conventional medicine (known as Allopathy) acknowledged it. One hundred years before physics understood the reality that matter contains energy he had described how it influences disease and the effects of medicines.
However, his best contribution to medicine was the formulation of the Law of Cure; that only a substance that can cause a problem can cure it. In other words Like Cures Like. For example, radiation causes cancer and medicine uses it to treat cancer. Sulphur causes skin eruptions yet medicine uses it to treat skin problems, usually in the form of tar. This is a simple example. Proper homeopathy is non toxic and treats the whole person rather than a single symptom in isolation.
He was the first in the history of medicine to test drugs before administering them. This was the beginning of the science known as Pharmacology.
He was wise enough to stress the importance of lifestyle, diet and hygiene. The famous writer Goethe said he was on a Hahnemannian diet.
Much of the European royalty were treated by him and his students. He was a professor at Leipzig University. The royal family in Britain have given their patronage to The Royal London Homeopathic Hospital since 1845.
Finally Hahnemann was buried with honour with many of the world's greats at the cemetery Pierre Le Chaise in Paris. Monuments to the great Hahnemann were later erected in Leipzig, Kothen and Washington where President Kinley and his wife attended with all the dignitaries of the State and army and a naval band played. After the erection of the monument the President invited 1000 guests to the White House where he received them personally, contrary to custom. Mr Griggs, the Minister of Finance delivered a speech on behalf of the American government. Considering that Hahnemann had never been to America it shows the respect the man and the system of medicine he developed had achieved.
Haehl Richard; Samuel Hahnemann: His Life and Works.
Bradford; Life and Letters by Rima Handley Rima.