The philosopher Mircea Florian, philosopher of realist-rationalist orientation, is the author of the philosophical system entitled Recessivity as the structure of the world. The volume "Logic of recessivity" recovers the manuscript kept in the archive of the philosopher's family; he completes through his publication the entire Florianist philosophical system. The work conceived and elaborated in the interwar period and republished today reveals to us an authentic rationalist philosopher, a defender of humanistic values.