b2 



THE VENOMS OF CERTAIN THANATOPHIDE^. 



The Actions of Venom Peptones on Animals in which the Pneumogastric Nerves 

 had been Cut. — Four experiments were made with the peptone on animals the 

 pneumogastric nerves of which had been previously cut. In three of the four there 

 was a primary increase in the pulse, while in the fourth there was a temporary 

 diminution followed by a rise above normal. These experiments are in accord with 

 those made with pure venom, and indicate a greater tendency to primary pulse 

 frequency after section of the pneumogastric nerves. 



One of the above experiments was made with the peptone from the Crotalus 

 adamanteus ; one with the Ancistrodon piscivorus ; and two with the Cobra. 



Experiment No. 62. 



Normal 



Normal 



Time: 



Pulsations 



min. see. 



per minute. 





285 



10 



285 



30 



285 



40 



300 



50 



300 



1 00 



300 



1 20 



300 



1 30 



300 



3 30 



315 



8 30 



330 



15 30 



345 



20 30 



325 



25 30 



315 



30 30 



315 



35 00 



315 



40 00 



315 



45 00 



270 



50 00 



255 



62 00 



285 



it No. 63. 





Time: 



Pulsations 



min. sec. 



per minute. 





295 



30 



315 



40 



315 



50 



310 



1 00 



310 



1 20 



315 



1 40 



320 



2 00 



330 



2 30 



310 



2 40 



102 



2 50 



150 



3 00 



240 



Pneumogastric nerves cut. Injected intravenously the peptone 

 from 0.015 gram dried venom of the Crotalus adamanteus. 



Struggles. 



Struggles. 



Killed. 



REMARKS. 



Pneumogastric nerves cut. Injected intravenously the peptone 

 from 0.015 gram dried venom of the Ancistrodon pisci- 

 vorus. 



4 20 



Dead. 



