The experience gained in animal experiments and on human material with the surgical modification used to ensure the prevention of reflux oesophagitis and improved functioning of the residual stomach, is presented. In animal experiments it was possible to prevent reflux oesophagitis and the weight gain was also more favorable than after oesophago-duodenostomy and Longmire's operation after which reflux-oesophagitis developed without exception. Seven such operations have been performed on man; one of the patients operated upon more than 7 years ago is still free from complaints. In order to assess the true value of the operation, conditions of absorption, conditions of absorption have to be studied in animal experiments and more experience has to be gathered on human material.