At the end of 1930, shortly after his postulation of the neutrino and immediately after his divorce and his mother's suicide, Pauli experienced a personal crisis. In January 1932 he consulted psychiatrist and psychotherapist Carl Jung, who also lived near Zurich. Jung immediately began interpreting Pauli's deeply archetypal dreams based on the I Ching, and Pauli became one of Jung's best students. He soon began to criticize the epistemology of Jung's theory scientifically, and this contributed to a certain clarification of Jung's ideas, especially about synchronicity. A great many of these discussions are documented in the Pauli/Jung letters, today published as "Atom and Archetype". Jung's elaborate analysis of more than 400 of Pauli's dreams is documented in "Psychology and Alchemy". In 1933 Pauli published the second part of his book on Physics, "Handbuch der Physik", which was considered the definitive book on the new field of quantum physics. Robert Oppenheimer called it "the only adult introduction to quantum mechanics."