. Radiography, X-ray therapeutics and radium therapy . Upper sac Channel Pylorus PlQ. 172.—Hour-glass contraction of the stomach.(1) Soon after ingestion of food. (2) Several hours after ingestion. traction in particular parts of the walls, ulceration generally beginning onthe lesser curvature of the stomach. The frequency of hour-glass contractionis probably greater than was at one time supposed. No doubt many more

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