In the four and one-half year period between July 1, 1928, and Dec. 31, 1932, 3,271 appendectomies were performed at the Koster Clinic; 4 appendixes showed tuberculosis. Tuberculosis of the appendix is one of the more rare manifestations of infection with the Koch bacillus in the human body. Corbin,1 in 1837, was the first to observe such a case. In 1838, Hallowel2 reported a death from peritonitis due to perforation of a tuberculous appendix. Following these observations a number of reports on tuberculosis of the appendix, cecum or both appeared at intervals. Koch's discovery of the tubercle bacillus, in 1882, greatly increased the impetus to the study of tuberculosis generally, and subsequently observations on this subject were reported more frequently. However, it was not until 1909, when Muller3 published his excellent monograph on tuberculosis of the appendix, that any definitely collective statistical study was made. He collected