“…This possib:lity is in accord with the data presented by Chandler and Bliss (1948), Tompsett, Shultz, and McDermott (1947), and Rammelkamp and Kiefer (1943), who showed that body fluids are capable of producing an inhibitory effect on antibiotic activity. Burkman, Henry, and Housewright (1947) and Price, Randall, and Welch (1948) also showed that the presence of specific inorganic salts and certain amino acids tend to decrease antibiotic activity. Inhibition of this type could occur in milk, because it is a body fluid containing some of the above-mentioned substances.…”