7o 



Scientific Proceedings (36). 



the portal vein and the point of entrance of the vena gastrica 

 dorsalis. The venous return from the spleen and pancreas was 

 excluded from the stromuhr. 



By stimulating the left splanchnic nerve, very marked reduc- 

 tions in the blood supply of the stomach were obtained. The 

 curve recorded by the stromuhr under these conditions does not 

 differ materially from the curves contained in earlier papers of the 

 writer on the vaso-motor nerves of the spleen, intestine and kidney. 



41 (451) 



The change in the venous bloodflow on administration 

 of amyl nitrite. 



By R. BURTON-OPITZ and H. F. WOLF. 



[From the Physiological Laboratory of Columbia University^ 



Amyl nitrite was injected into the femoral artery, while the 

 flow in the corresponding vein was being measured by a stromuhr. 

 The resulting dilation of the capillaries betrayed itself by a marked 

 increase in the flow and a corresponding rise in venous pressure. 

 The arterial pressure recorded in the opposite femoral artery was 

 not affected if the reaction remained confined to the area of 

 the leg. 



When the amyl nitrite was administered by inhalation or when 

 the drug was injected into central venous channels, the venous 

 bloodflow exhibited a decrease in accordance with the loss in 

 arterial tonicity. The venous pressure did not undergo a material 

 change during the period of arterial depression. 



Inhalations of amyl nitrite were also resorted to, while the leg 

 was being perfused with defibrinated blood. As in this case no 

 alterations in the quantity of the perfusing liquid could be obtained, 

 the experiment favors the view that amyl nitrite exerts a peripheral 

 and not a central effect. 



