The author states that works such as those of P. Janet, which adopt a scientific method and are content with strict facts of clinical observation, are rare. It is essentially with a methodological purpose that the author wished to write this schematic book, in order to insist on the necessity of an instrument of clinical approach which seemed to him capital: the method of observation. In spite of our present involvement in theory he believes that a return to clinical observation must be realized.
Research in psychopathology has always oscillated between two tendencies: neurogenesis and psychogenesis. In view of the struggles of generations of clinicians toward the comprehension of psychopathological phenomena and before the progress of biochemistry and neurophysiology, it remains to choose the best direction for the comparative study of the clinical and biological data. The modern organodynamic and the psychoanalytical approach do not seem