Syphilis of the stomach is fairly common. In a personal series of 1,000 gastro-intestinal x-ray examinations, 22 of which had a positive Wassermann reaction, or 2.2 per cent, two of this number, or 0.91 per cent, were found to have gastric lesions which were probably tertiary in character. One of these entirely disappeared with antisyphilitic treatment. Perforation of a syphilitic gumma, as in this case, is relatively rare. Especially rare is the occurrence of a perforation, as evidenced by x-ray examination in this case. Case Report.—G. D., male, aged 54, first came under observation on May 21, 1939. The presenting symptoms were: loss of weight, gastric pain, and anemia. He had an evident pyloric obstruction, but because the blood serum and the spinal fluid reactions were 4 plus, the possibility of the obstruction being due to syphilis was considered. X-ray examination showed the pylorus to be greatly deformed, with almost complete obstruction, and only a small amount of opaque mixture leaving the stomac...