THIS report is a study of 533 patients who underwent 550 operations on the biliary tract during the five year period beginning January 1940 and ending December 1944 at the Cedars of Lebanon Hospital. The series includes multiple operations on 17 patients. All operative procedures on the biliary tract are included. These operations were carried out by the various members of the attending and house staffs on both private and clinic patients. Of the 533 patients, 406 (76 per cent) were women and 127 (24 per cent) were men (table 1). The ratio of women to men was approximately 3:1. The incidence of jaundice is interesting. Of the 533 patients, 110 (20.7 per cent) were jaundiced preoperatively. Of these 110, 66 (60 per cent) were women and 44 (40 per cent) were men. The ratio of jaundiced women to jaundiced men is 3 to 2. It is interesting to note