Based on two clinical cases in analysis, Charles Odier's report establishes the distinction between the hysterical and obsessional neuroses on the existence of pregenital regression and drive defusion. It was also, in 1927, a powerful illustration of “phallic monism” of female sexuality in which neurosis is the direct opposite of perversion, if not of psychosis. The reference to oral sadism makes the absence of any reference to the mother as the primary object all the more remarkable.