Circulation Through the Kidneys. 



45 



fall in venous pressure, the decrease being in harmony with the 

 height of the ureter pressure. A pressure of 20 mm. Hg or less 

 remained ineffective when introduced next to the bladder, but pro- 

 duced a weak retardation of the venous flow when led into the 

 upper portion of the ureter. 



On increasing the pressure within the bladder, no effect upon 

 the renal circulation could be noticed, not even when the organ 

 was inflated until it burst. 



By injecting solutions of adrenalin into the renal vein centrally 

 to the stromuhr, a retardation of the venous flow was produced. 

 The retardation appeared after an interval of from 7-9 seconds. 

 The experiments speak against the presence of vaso-motor nerves 

 in the central veins. 



24 (280) 



Some data regarding the portal circulation. 



By R. BURTON-OPITZ. 



[From the Physiological Laboratory of Columbia University , at the 

 College of Physicians and Si/rgeons.^ 



The stromuhr referred to in the preceding abstract was used 

 in obtaining quantitative data regarding the portal circulation. 

 The experiments so far performed have given an average flow of 

 1.56 c.c. per second in the splenic vein (weight of spleen 78 grams) 

 and a flow of 1.05 c.c. per second in the mesenteric. 



In the case of the spleen, the veins draining the pyloric end of 

 the stomach and fatty tissue of this region were ligated. The 

 stromuhr was then inserted centrally to the last branch draining 

 this organ. The venous pressure was recorded centrally to the 

 instrument. In the case of the mesenteric the stromuhr was 

 inserted distally to the point of entrance of the vena gastro- 

 lienalis. 



The nerves innervating the spleen and intestines were stimu- 

 lated electrically while the blood flow in the veins was being 

 measured. For the stimulation were selected first of all the entire 

 bulk of the prae or post ganglionic fibers, and later on the most 

 prominent fibers of the post-ganglionic paths. 



On stimulation of the post-ganglionic fibers innervating the 



