. American quarterly of roentgenology . Fig. 1. Perforating gastric ulcer, with hour-glass contractions, and pyloric stenosis(due to adhesions). The arrow points tothe abrupt termination of the perfora-tion. Confirmed by operation by Fig. 2. Tetanic hour-glass contraction of thestomach due to small ulcer on the lesser cur-vature, studied and confirmed at operationby Prof. Laplace 4 years ago.

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