92 



THE VENOMS OF CERTAIN T H A N A T P H ID E ^E. 



This single experiment confirms the statements of Fayrer and of Wall in regard 

 to the convulsivant power of Daboia. The spasms are not due to defect of oxygen, 

 as they arise early and occur despite the use of artificial respiration. Ancistrodon 

 venom seems to have the same capacity to produce convulsions. 



The Action of Pure Venoms on the Blood Pressure of Animals with Cut Pneumo- 

 gastric Nerves. — After section of the pneumogastric nerves, including the depressor 

 fibres, we find that the same alterations occur in the blood pressure as in normal 

 animals. Nine experiments were made altogether : two with the venom of the 

 Crotalus adamanteus ; one with the Crotalus horridus ; two with the Ancistrodon 

 piseivorus ; one with the Ancistrodon contortrix; and three with the Cobra. 



Experiment No. 19. 



Normal 



Normal 



Time : 



Pressure 



min. sec. 



m. m. 





96 



10 



74 



30 



68 



1 00 



68 



1 30 



76 



2 00 



64 



2 30 



60 



5 30 



44 



7 00 



44 



8 30 



48 



8 40 



42 



9 00 



46 



9 10 



44 



9 20 



44 



9 30 



44 



It No. 20. 





Time: 



Pressure 



min. sec. 



m. m. 





130 



10 



100 



20 



90 



30 



96 



40 



76 



50 



56 



1 00 



50 



1 10 



38 



1 20 



32 



1 30 



22 



Injected intravenously 0.003 gram dried venom of the Cro- 

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



Injected the same as above. 



Dead. 



Injected intravenously 0.015 gram dried venom of the Cro- 

 talus adamanleus dissolved in 1 c. c. distilled water, 



Dead. 



