96 



THE VENOMS OF CERTAIN THANATOPHIDEJ5. 



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 contort ri-x, 

 and one with Cobra venom. 



Experiment No. 28. 



Normal 



Experiment No. 29. 



Normal 



Time : 

 min. sec. 



5 

 10 

 20 

 30 

 40 

 50 

 00 

 30 

 30 



3 30 



30 

 30 

 00 



Pressure 

 m. m. 

 66 

 60 

 58 

 58 

 64 

 62 

 58 

 56 

 48 

 40 

 60 

 56 

 40 



REMARKS. 



Injected intravenously 0.003 gram dried venom of the Cro- 

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



Dead. 



REMARKS. 



Injected intravenously 0.006 gram dried venom of the Cro- 

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



Dead. 



