The organisms most commonly found growing on poultry carcases stored at 1° are pigmented and nonpigmented strains of Pseudomonas, Pseudomonas putrefaciens and strains of Acinetobacter. A comparison of total viable counts at 20 and 30° using stored turkeys, showed that certain strains could not be recovered at the higher temperature. When inoculated into minced breast and leg muscle, it was found that the pigmented and nonpigmented strains of Pseudomonas grew well in both muscle tissues. Strains of Acinetobacter groups B and C failed to grow in the breast muscle but grew in the leg muscle, Acinetobacter C growing much more rapidly than Acinetobacter B. The growth of Ps. putrefaciens was much faster in the leg muscle than in the breast muscle. These differences could partially be explained by differences in pH, the breast muscle having a pH value 5.7—5.9 compared with a pH value 6.4—6.7 for the leg muscle. The possible significance of these results in relation to the distribution and growth of these organisms on the chicken or turkey carcase is discussed.