[Gilbert Ballet's discourse on the method: rules in psychiatry]

G. Ballet, former Chairman (1909-1910) of the S.F.H.M., wrote a remarkable "Discourse on the Method" for Psychiatry in order to introduce his "Clinics" (1887). This work, revisited for our present purpose, forecasts the main theories in search of a scientific psychiatry. It gets thereafter, a premonitory value.