Cholecystography, as brought forth by Graham, Cole and their co-workers, is quite generally accepted in determining whether or not the gallbladder is functioning normally. The work of Kirklin, Moore, Stewart and others has done much to prove the accuracy of the method. Through careful cholecystographic studies and with an abundance of available material, Kirklin has had an excellent opportunity to check his roentgenographic observations operatively and pathologically. Other investigators have also done much work which has substantiated the original work of Graham and Cole. Since the method was originated there has been ample time and sufficient operative and pathologic study to prove its accuracy. There is practically no procedure in diagnosis which has demonstrated so conclusively its accuracy and importance when made under proper conditions; namely, close cooperation and control of the patient from the time the dye is taken until the last film is made. The importance of cooperation