Science in progress : the society of the SIGMA XI devoted to the promotion of research in science : Sigma Xi-RESA national lectureships 1955 and 1956 / Edited by Hugh Taylor. Science Periodicals. Research Periodicals. Research Periodicals. Science Periodicals. Q171 .S582 500 SCI Includes index. SERBIB/SERLOC merged record Vols. for <1964-> contain national lectureships of the Society of Sigma Xi and the Scientific Research Society of America. New Haven : Yale University Press, 1939. 1939. 1938 Text Collection 321 p. : eng Mrs. Hepsa Ely Silliman memorial lectures Mrs. Hepsa Ely Silliman memorial lectures. Mrs. Hepsa Ely Silliman memorial lectures Also issued online. Also issued online.