Typewritten letter on 25% cotton paper, signed in black ink by Carl Jung. Dated May 7th, 1959, and addressed to Stephen I. Abrams of the Parapsychology Society at the University of Chicago. Single page measuring 7.25" x 8.5", with approximately 4.5" x 5.5" of typing space.
In this follow-up to his March 5th letter, Jung continues his critique of experimental parapsychology, arguing that ESP cannot be treated as a constant quality. He invokes the archetype and the unus mundus to explain how the same meaning can manifest simultaneously in both psychic and physical events. The postscript addresses the difficulty of conveying the concept of the archetype, emphasizing that numinosity—like the expression in a human eye—must be experienced rather than described.
An important correspondence offering insight into Jung's late-period thinking on synchronicity, parapsychology, and the limits of rationalistic experimental method.