"Scientific Research Society of North America, Sigma Xi" . . . . . . . . . . . . . . . . . . . . . . . . "Sigma Xi" . . "SIGMA XI - The Scientific Research Society" . . . . "Sigma Xi: The Scientific Research Society" . . . . . . . . . . . . . . . . . . . . . . . . "Sigma Xi Research Honor Society" . . . . . . . . . . . . . . . . . . . . . . . . "Sigma Xi the Scientific Research Society" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Sigma XI" . "Sigma Xi: The Scientific Research Honor Society" . . . . . . . . . . . . . . . . . . . . . "Sigma Xi Distinguished Lecturer" . "Sigma-Xi" . . . . . . . "Society of Sigma Xi" . . . . . . . . . . . . . . . . . . . "Sigma Xi Society" . . . . . . . . . . . . . . . "Sigma Xi" . . . . . . . . . . . . . "Scientific Research Society" . . . . . "Sigma Xi, The Scientific Research Society" . . . . .