THE ACTION OF VENOMS UPON ARTERIAL PRESSUKK 



99 



of the vaso-motor centres A fall of pressure does, however, ultimately occur, 

 and, excepting in the case of the Cobra, increases until death ensues 



In seven other experiments, supplementary to the above, in which we made 

 section of the pneumogastric, depressor, and sympathetic nerves in the neck, and 

 section of the spinal cord in the middle or upper cervical region, thus cutting off 

 both the heart and capillaries from centric nervous influence, we obtained results 

 which were practically the same 



Three of these experiments were made with the venom of the Crotalus adaman- 

 ieus , one with that of the Crotahw liorridus ; one with the Ancistrodon piecivorus; 

 one with the Ancistrodon contortnx, and one with the Cobra. 



Experiment No 36 



Normal 



Time 

 min sec. 



10 



20 

 30 

 40 

 00 

 20 

 40 

 00 



2 20 



Experiment No. 37. 



Normal 



Experiment No 38. 



Normal 



Time: 

 min. sec. 



5 



10 

 20 

 30 

 40 

 50 



Pressure 



in. in. 



62 

 56 

 46 

 56 

 52 

 4G 

 40 

 36 

 30 

 24 



Pressure 

 m. m. 

 30 

 32 

 28 

 28 

 26 

 28 

 28 



REMARKS. 



Injected intravenously 0003 gram dried venom of the Cro- 

 talus adamanteus dissolved in 1 c c distilled water. 



Dead. Heart arrested in diastole ; blood incoagulable ; 



few ecchymoses in peritoneum. 

 The section of the cord was not quite complete. 



REMARKS. 



Injected intravenously 0.003 gram dried venom of the Cro- 

 talus adamanteus dissolved in 1 c. c. distilled water. 



Dead. Heart arrested in diastole ; blood incoagulable ; no 

 ecchymoses in serous tissues 



REMARKS. 



Injected intravenously 0.003 gram dried venom of the Cro- 

 talus adamanteus dissolved in 1 c. c. distilled water. 



