. Radiography and radio-therapeutics . Fig. 299.—Hour-glass contraction. Four railiograplis taken at intervals of two seconds (y^^ second exposure). The peristalticwave is well seen on the walls of the upper sac. A small penetrating ulcer on lessercurvature with barium food in .situ and gas bubble shown in upper part. marks the seat of an ulcer on the lesser curvature, which by cicatrisation hasled to organic contraction of the stomach. This condition has to be dis-tinguished from spasmodic hour-glass contraction, and from that caused bynew growth of the body of the stomach.

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