Easton, PA: Society of the Sigma Xi 1959. First Edition. 305A-351A, , 459-580, 355A-410A pages. 6 x 9 1/4 inches. Stapled printed wrappers. Minor insect damage to spine, several paper blemishes on rear wrapper. Clean internally. Very Good. Wraps. 
"American Scientist (informally abbreviated AmSci) is an American bimonthly science and technology magazine published since 1913 by Sigma Xi, The Scientific Research Society. Each issue includes feature articles written by prominent scientists and engineers who review research in fields from molecular biology to computer engineering." (wiki)
Articles in this issue include "The Development of Learning in the Rhesus Monkey" by Harlow, and "The Prospects of Genetic Change" by Nobel Laureate H. J. Muller. Also, "Essentials for Mapping the Moon" by Zdenek Kopal and "Non-Conservation of Parity" by Nobel Laureate Blackett. Many advertisements, most on pages numbered with a trailing 'A'.