10 CORA SENNER WINKIN 



high level of blood pressure. Occasionally a sharp depressor effect 

 may be recorded, which is rapidly compensated for; this effect gives an 

 M-shaped appearance to the curve. On the whole, with the stellate 

 ganglia excised, pressor responses are more promptly executed and 

 longer maintained. In six additional cats, section of the accelerators 

 was complicated by other lesions. In the two cases in which it was 

 preceded by low section of the sympathetic chain, an anemic increment 

 of 80 mm. was obtained in each. 



Fig. 1. Cat 4; Occlusion 1. Cerebral anemia, anomalous contour of curve. 

 In this, great fall of pressure replaces the rise ordinarily obtained. The levels of 

 blood pressure before anemia, after anemia and after recovery of bulbar function 

 are shown. Head arteries were released immediately after the rise of pressure, 

 in which the pre-occlusion level was partially recovered. Pressure fell sub- 

 sequently as low as the lowest point obtained during anemia, but regained 90 mm. 

 above this level with the return of bulbar function. 



Occlusion 2: Cerebral anemia; record following excision of both stellate gan- 

 glia. When anemia is induced, pressure is 50 mm. lower than after recovery of 

 bulbar function, prior to section of the stellates; M-shaped curve, showing sharp 

 immediate rise of pressure, almost to its maximal height; vagus effect appears at 

 crest of wave. Temporary recovery on release of head arteries, followed by fall 

 to lowest level of pressure (55 mm. Hg. above base line) . This low level was three 

 times reached in this animal. Final rise of pressure on renewed return of res- 

 piration and other medullary activities. 



Each occlusion occupied 3 minutes. 



