This is done by means of a rectal tube and a fountain syringe provided with a scale indicating the amount of water used. In case of stricture, especially of the lower portion of the colon, the quantity of water which can be injected is not great, while ordinarily from three to five quarts of water can be poured in. Inasmuch as even normally some people are not able to hold large amounts of water in the bowels without experiencing considerable discomfort, the quantity of fluid which can be injected without pain is not of great diagnostic value. Filling up the bowel with water can also be made use of for the determination of the position of the colon, as this organ will then give a dull sound. For this purpose, however, the procedure in question is not so good as the above-described method of inflation with air.