“…Cxytetracycline 70-91 Harkness, 1953;Willcox, 1953;Willcox, 1955a;Gartman and Leibovitz, 1955;Willcox, 1957;Doyle, Gill, and Laird, 1957;Jelinek, 1957;Morton andRead, 1957 Fowler, 1958. Chlortetracycline 59-81 Harkness, 1953;Willcox, 1953;Jensen, 1954;Willcox, 1955a;Gartman and Leibovitz, 1955;Willcox, 1957;Morton and Read, 1957 Willcox, 1955b; Prebble, 1957;Willcox, 1957;Grimble, 1968;Csonka and Spitzer, 1969. Chloramphenicol 31-78 Harkness, 1953;Willcox, 1953;Gartman and Leibovitz, 1955;Willcox, 1957;Morton and Read, 1957. Streptomycin 38-70 Harkness, 1953;Willcox, 1953;Gartman and Leibovitz, 1955;Willcox, 1957;Doyle and others, 1957;Jelinek, 1957;Morton and Read, 1957;Fowler, 1958. Penicillin 41-60 Willcox, 1953; Gartman and Leibovitz, 1955;Willcox, 1957;Morton and Morrison, 1963 Babione and Graham, 1952;Willcox, 1953;Willcox, 1957;Doyle and others, 1957;Jelinek, 1957;Morton and Read, 1957;Fowler, 1958. Sigmamycin 77 Oates, 1958 the study.…”