The author first outlines Freud's classical explanation for Schreber's paranoid delusions. He then uses further material from Schreber's Memoris as one of the bases for redefining the dynamics of Schreber's paranoid process and the development of paranoia in general. Meissner discusses the relationship of masochism and of depression to paranoia, particularly emphasizing how paranoia acts as a defense against depression. One of the roots of paranoia is found in the individual's early narcissistic development. Meissner's theory of paranoia involves a complicated concept of introjects in which Freud's theories of homosexuality do not play a role. Important in the development of Meissner's ideas are Schreber's unusual parents, a very sadistic, dictatorial, unremittingly cruel father and a submissive, masochistic mother.