Aurora Consurgens, the 89th title in the series of Studies in Jungian Psychology by Jungian Analysts, reputed to be the last work of St. Thomas Aquinas, was seen by psychologist Cari G. Jung as a validation of his view that the traditional practice of alchemy was an attempt to express unconscious psychic contents through their projection onto matter. Marie-Louise von Franz's analysis and commentary suggest that Aquinas experienced a breakthrough of the unconscious while expounding on the vision of the mystic marriage in the biblical Song of Solomon. She also draws attention to insights that she believes relevant to the process of individuation in modern men and women.