Philadelphia: The American Philosophical Society 1949. First Edition. , 521-548, iv pages. 8 x 10.5 inches. Printed tan wrappers. Signature of previous owner (Sidney A. Bludman) at top of front wrapper, and pencilled notes in his hand throughout. Minor browning to extremities, wear to spine obliterating title. Good. Staplebound wraps. 
Contains articles by Wigner, Eugene P. , Robertson, H. P. ,Clemence, G. M. and Weyl, Hermann as well as "Dr. Albert Einstein and American Colleagues, 1931" which reproduces Einstein's handwritten response to the welcome of scientists at CIT in 1931, and also Dr. Millikan's introduction.