While paging through Volume 4, I happened upon an engaging title, "The Stockholm Papyrus, An English Translation with Brief Notes" (1). I learned from reading Earle Radcliffe Caley's introductory remarks that "The Stockholm Papyrus" is the second of a pair of papyri. Caley had published a translation of "The Leyden Papyrus X" the previous year (2). Originally written in Greek in the third century C.E., the two sources “are by far the earliest original historical evidence...concerning the nature and the extent of ancient chemical knowledge."