Lancaster, PA: The American Physical Society, 1937. Wraps. First Edition. 1079-1200 pp. 4to. Green paper wraps that are quite clean. Ex-library with small black library stamp at lower right corner of front cover, no other markings. Very Good.
Proposes the scattering matrix (or S-Matrix), the starting point for string theory. Also contains “On the Nature of Cosmic-Ray Particles” by Yoshio Nishina, M. Takeuchi, and T. Ichimiya (Physical Review 52 No. 11 pp. 1198–1199), confirming the discovery of the muon.