“…To a considerable degree the development of practical media was advanced by the unpublished contributions of a number of independent investigators whose names are listed in the acknowledgment. In addition to the unpublished data cognizance was taken of certain pertinent observations recorded in the literature, such as the work of Burke (1919), Elberg and Meyer (1939), Gladstone and Fildes (1940), Dack and Wood (1928a;1928b), Dack, Wood, and Dehler (1928), Wagner, Meyer, and Dozier (1925), Dozier, Wagner, and Meyer (1924), Stark, Sherman, and Stark (1928), and Lamanna and Lewis (1946). The reviews on bacterial nutrition by Knight (1938) and Peterson and Peterson (1945) were also helpful.…”