Pressure sustained by the venous valves was studied by means of a self-recording device; 47 valves of the great saphenous veins of the thigh were tests. A total of 51 valves taken from 10 cadavers were studied. The instruments for and the method of ventriculojugulostomy are described. It consists in diverting the CSF from the lateral ventricle of the brain into the internal jugular vein by means of ventricular silicone rubber catheter and a venous auto- or homograft. Despite the severe contingent of patients subjected to surgery, analysis of 12 operations allows the suggested method to be used for treating hydrocephalus both in adults and in children.