This is a study of the novel "El obsceno pajaro de la noche" from the perspective of Jung's analytical psychology. The author explores how Jose Donso utilized Jung's material to create his own literary version of that psychology. The novel is a structure of carefully connected multi-level images which to originate in the disturbed pysche of the protagonist and are shown to depict the Jungian concept of indivduation. The author demonstrates that the imagery derives from alchemy's prima materia, Mercurious, soluto. Sulphur/quicksilver, retort, sol/luna, together with alchemical referneces to mythology - all is critcisim on the novel. THe documentation also includes substansive material from the Hebrew Cabala and the Hindu Upanishads, parallel fields referred to by Jung and incorporated by Donso.