"Medicine... was called in its origin the Art of Healing. It consisted at that time, in a succinct description of diseases, which had been observed, and the indication of the remedies employed to combat them. These two parts... relate to man in a state of disease only. Subsequently, those who devoted themselves to the practice of Medicine, enlarged, gradually, the field of their observations. Nosological descriptions became more extended and numerous, and the therapeutical indications more precise. They became convinced, that to understand diseases well, it was necessary to study man in a state of health. Thus Anatomy... and Physiology... became important branches of medical science. Experience, also, taught men that it is always more important, and often easier, to prevent the development of certain diseases, than to arrest their progress when once developed. Consequently physicians... traced the rules for the preservation of health, and the collection of these rules constituted a new branch of the art called Hygiene. These successive additions necessitated a change in the definition of Medicine; the first, not embracing any longer all the departments of the science, the following was then nearly unanimously adopted: "Medicine is a science which has for its aim, the promotion of Health, and the cure of Disease.""