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In the years 1720-1820 medicine changed from an art into a science. The slow construction of clinical science, a process still to be completed, has many founding fathers. Here the transition is analyzed through the biographic studies of John Hunter (1728-1793), Domenico Cotugno (1736-1824) and Pierre Joseph Desault (1738-1795) who respectively taught in London, Naples and Paris. Because of their scientific stature they were able to plan, build and foresee the impact of these changes.

Clinical practice became clinical science in the years 1720-1820. There were many reasons for this transformation. The discoveries by Santorio Santorio, William Harvey, Marcello Malpighi, Giovanni Alfonso Borelli, Lorenzo Bellini, Thomas Sydenham, Giovanni Maria Lancisi, were perceived by students who asked for changes in the medical curriculum. In 1761 Morgagni centered the study of diseases on morbid anatomy, a way to control at autopsy the validity of diagnosis. J.P. Frank who worked on public health and John Locke who supported a method of scientific reasoning based on asking questions were also instrumental for changes. Hospitals, formerly hospices for the poor, became places for curing and healing. Military hospitals represented models to be followed. In Vienna Marie Therese inaugurated the Allegemein Krankenhaus in 1785. In revolutionary France Fourcroy with the law Frimaire An III, 1794 gave a new rationale. Medicine and surgery were unified in the curriculum. Basic sciences were introduced. Dissection became compulsory, practical teaching became the rule. But it was with John Hunter, Domenico Cotugno and P. Joseph Desault that the great advancement was achieved. They were anatomists and therefore they made the knowledge of human body the core of medical curriculum. However experimentation on animals, as well as practical bedside teaching at the hospital also became important. Through their work hospitals and universities were associated in a common goal.

Pierre-Joseph Desault (1738-1795) was the first French professor of clinical surgery. He was chief surgeon at La Charité and Hôtel-Dieu in Paris, where he developed a new method for teaching anatomy and modified the teaching of surgery. His fame was due to his dedication and to the number and quality of fellows, who included Bichat, Louis, Corvisart, Dupuytren, Percy, Richerand, Petit, Chopart, and Gavard. He taught while performing surgery, and his school included up to six hundred fellows at a time, practicing in the 1200-bed Hôtel-Dieu. He "imprinted" his pupils with his professional teaching, his surgical procedures and his personal charm.