Case 1. —A woman, aged sixty, came to the clinic complaining of “stomach trouble” of one year's duration. She had been in excellent health and able to eat anything until one year before, when she had a sudden attack of severe pain in the left upper quadrant, radiating to the epigastrium, with nausea and vomiting. The attack lasted about five minutes; there was no residual soreness, but the patient became “yellow” half a day later, the discoloration lasting three days. Since that time she has had intermittent attacks of nausea about one hour after eating, relieved at once by vomiting or by soda, hunger pain relieved by food, belching, and sour eructations. One month before coming here she experienced a second attack, similar to the first but not so severe. At this time she consulted a physician, who found pus in the urine. Examination at the clinic revealed a movable tender mass in the right flank supposed to be a kidney. A roentgenogram revealed a large shadow in the area of the right kidney at the level of the fourth lumbar vertebra, and cystoscopic examination showed the function of the right kidney to be greatly impaired. Roentgenoscopy elicited a narrowing of the antrum of the stomach, the prepyloric spasm so frequently associated with gastric ulcer, and the films presented a saucer-shaped defect in the duodenal cap. This was reported as a lesion of the pyloric end of the stomach. At operation, a soft movable tumor, about 6 cm. in diameter, was found at the pyloric end of the stomach; this tumor could be invaginated into the duodenum. The patient also had a gastric ulcer on the lesser curvature, about 7.5 cm. above the pylorus. Because of the double lesion about one-third of the stomach was resected (posterior Polya). The pathologic report was subacute gastric ulcer (9 mm. in diameter) and an area of polypoid mucosa near the pylorus, extending into, but not involving, the duodenum. The patient had an uneventful convalescence and was operated on again twenty days later, when a right pyonephrosis with one stone, 3 by 2.5 cm., and some sandy material was found. The kidney was resected, and pathologic examination showed that 80 per cent of the renal substance was destroyed. The patient was dismissed fifteen days after the second operation (Fig. 1). Comment. —The possibility of the invagination of the tumor into the duodenum explains the two severe attacks which the patient experienced, with temporary jaundice, at wide intervals. The tumor probably exerted a ball-valve action on the pyloric ring and was doubtless impacted at the times marked by these two attacks. Case 2. —A man, aged fifty-one, came to the clinic in February, 1925, complaining of anemia, and weakness in the legs.