In the spirit of elitism established by Bonaparte, clerkship hospitals were established in Paris in 1802. The history of the clerkship hospitals Paris is far from linear. From 1802 to the end of the Great War, ease of entrance examination, due to a number of places sometimes equal or exceed the number of candidates, devalued the prestige of the external function whose only advantage, then, is to be the front of the boarding gate. The legitimacy of this institution was often questioned by many doctors. Significant changes occurred from the years 1920-1930: the selection became much more severe, with more interesting functions and privileges, and the impact to one's finances, education and future career were very significant. It is now a practical school of very high quality for the training of doctors, including specialists. This book analyzes the status, functions and external life since the founding of the clerkship hospitals Paris in 1802, until its death, under the guise of the clerkship for all, in 1968.