A prevalent belief that the intravenous method of cholecystography is consistently and definitely superior to the oral method in diagnostic results has stimulated me to reiterate my own convictions to the contrary and to recount certain rather common errors in the oral technic which may foster the opinion that it is less reliable than the intravenous method. For a long time I accepted the view that the intravenous method was somewhat more trustworthy, although I preferred to give the dye orally as a routine and reserved the intravenous test for cases in which the oral was indecisive. However, with added experience and the adoption of an appropriate oral technic I have become thoroughly convinced that, when the oral method is properly executed, its efficiency is equal to that of the intravenous method and that adverse comparisons of the two methods are usually based on results derived from faulty oral technics.