44 



Scientific Proceedings (26). 



The characteristics of this hemolytic substance in the serum 

 of tumor dogs have been the subject of further study. The serum 

 loses some, or only little of its power, by being passed through a 

 Berkefeld filter. Heating it to 85 0 for one hour does not destroy 

 its activity. It differs markedly from the immune bodies known as 

 amboceptors. It resembles in certain respects the hemolytic sub- 

 stances derived by extraction from necrotic tumors. 



23 (279) 



On the circulation through the kidneys. I. On vaso-motor 

 reactions. II. The renal blood flow in relation to the 

 pressure in the ureter and bladder. III. The 

 effect of solutions of adrenalin. 



By R. BURTON-OPITZ and D. R. LUCAS. 



[From the Physiological Laboratory of Columbia University, at the 

 College of Physicians and Surgeojis.~\ 



The experiments embodied in this abstract deal quantitatively 

 with the renal blood flow, under different experimental conditions. 

 They were performed upon dogs with the stromuhr described by 

 Burton-Opitz. 1 The right and the left renal veins were used. 



Besides the quantitative data, the authors succeeded in obtain- 

 ing vaso-motor effects on stimulation of the prae, as well as post 

 ganglionic fibers, the constrictory effects being in both cases the 

 most prominent. The constriction of the blood vessels of the 

 kidney was betrayed by a decrease in the venous return from this 

 organ and a fall in venous blood pressure, this change being pre- 

 ceded by a brief increase of flow. 



Among the post ganglionic fibers (renal plexus) a nerve was 

 isolated which gave decided vaso-constrictory results. 



In another series of experiments the pressure in the ureter was 

 increased while the blood-flow in the corresponding renal vein was 

 being recorded. The pressure was increased by means of air led 

 into the ureter in the immediate vicinity of the kidney and of the 

 bladder. Every increase in pressure from 20-120 mm. Hg re- 

 sulted in a decrease in the venous return from the kidney and a 



'Burton-Opitz: Arcbiv. f. d. ges. Physiologie, 1908. 



