THE ACTION OF VENOMS UPON ARTERIAL PRESSURE 



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- 

 teus, one with that of the Crotalus horridus ; one with the Ancistrodon piscivorus ; 

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



Experiment No 36 



Nonnal 



Time 



Pressure 



niiu 



sec. 



m. m. 

 62 





10 



56 





20 



46 





30 



56 





40 



52 



1 



00 



46 



1 



20 



40 



1 



40 



36 



2 



00 



30 



2 



20 



24 



Experiment No. 37. 



Normal 



Til 



ne: 



Pressure 



miu. 



sec. 



m m. 

 48 





10 



46 





20 



48 





30 



46 



1 



00 



48 



1 



20 



46 



3 



20 



40 



3 



50 



32 



5 



50 



36 



7 



50 



30 



Experiment No 38. 



Normal 



Time: 



Pressure 



lin. sec. 



m. m. 





30 



5 



32 



10 



28 



20 



28 



30 



26 



40 



28 



50 



28 



Injected intravenously 003 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 



Injected intravenously 0.003 gram dried venom of the Cro- 

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



