For many years physicians have been interested in the rate of progress of food residues in their passage through the body. In making tests, patients have been required to swallow insoluble matter, such as small pieces of metal and charcoal or dye substances, which could be easily detected in the excretion. When the X-ray was discovered, barium sulphate, which is opaque to the Xray, was given, and the passage of the barium was observed through the fluoroscope. The giving of a large amount of indigestible material like barium with a small amount...
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