96 



THE VENOMS OF CERTAIN THANATOPHIDBi!. 



the normal, but in a few moments a rise occurred which continued to increase for 

 half an hour, when the animal' was killed. 



In this series we observed a marked difference from the preceding (unless the 

 dose had been immediately toxic), since the profound primary fall of pressure was 

 not observed, excepting in a very slight degree if at all; we found, however, that 

 the ultimate fall of pressure still occurred, save in the case of the Cobra. 



Eight experiments were made : two with Crotalus adamanteus ; one with Cro- 

 talus horridus ; three with Ancistrodon piscivorus ; one with Ancistrodon conlortrix, 

 and one with Cobra venom. 



Experiment No. 28. 





Time: 



Pressure 





min. 



sec. 



m. m. 



Normal 







62 







9 



70 







20 



56 







30 



56 







40 



58 





1 



00 



58 





1 



20 



56 





1 



30 



48 





1 



40 



46 





2 



00 



44 





2 



20 



40 





2 



40 



38 





5 



20 



36 





6 



50 



36 





1 



20 



36 





8 



00 





Experim 



ent No. 29. 







Time: 



Pressure 





min. 



sec. 



m. m. 



Normal 







66 







5 



60 







10 



58 







20 



58 







30 



64 







40 



62 







50 



58 





1 



00 



56 





1 



30 



48 





2 



30 



40 





3 



30 



60 





4 



30 



56 





5 



30 



40 





8 



00 





Injected intravenously 0.003 gram dried venom of the Cro- 

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



Dead. 



Injected intravenously 0.006 gram dried venom of the Cro- 

 talus adamanteus dissolved in 1 c. c. distillecLwater. 



Dead. 



