The author contends that the problem in Macbeth is the protagonist's uncertainty as to whether he is an effeminate man or a mannish woman. Lady Macbeth represents both the projected feminine aspect of Macbeth and Macbeth's mother. She, like the witches, is both phallic and evil, and bears the responsibility for the evil in his nature. While the paper contains interesting ideas, readers may wish they had been better clarified and substantiated.