THE ACTION OF VENOMS UPON THE PULSE-RATE. 



83 



Experiment No. 64. 



Normal 



Time: 

 rain. sec. 



10 

 20 

 40 

 00 

 30 

 30 

 30 

 30 

 30 

 00 

 30 

 30 

 30 



Pulsations 



per minute. 



230 



235 

 240 

 230 

 230 

 230 

 230 

 230 

 230 

 220 

 220 

 225 

 230 

 235 



Pneumogastric nerves cut. Injected intravenously the peptone 

 from 0.005 gram dried Cobra venom. 



Twitchinnrs. 



Killed. 



Experiment No. 65. 



Normal 



Time: 

 min. sec. 



10 

 20 

 40 

 00 

 00 

 00 

 00 



1 

 3 

 5 



16 



34 00 



Pulsations 

 per minute. 



265 

 265 

 255 

 260 

 260 

 270 

 270 

 275 



Pneumogastric nerves cut. Injected intravenously the peptone 

 from 0.006 gram dried Cobra venom. 



Dead. 



The Actions of Venom, Peptones upon the Pulse-rate of Animals after Section 

 of the Pneumogastric Nerves and Cervical Spinal Cord. — Six experiments made 

 on animals in which the heart was cut off from central nervous influence by section 

 of the pneumogastric nerves and section of the spinal cord in the middle cervical 

 region gave uniform results. Three were made with peptone from the venom 

 of the Crotalus adamanteus ; two with the peptone from the Ancistrodon piscivortis, 

 and one with that of the Cobra. In all of these experiments there was a diminu- 

 tion of the pulse-rate, and usually this was well marked. These results are also 

 in accord with what was found in experiments with pure venom. 



Experiment No. 66. 





Time: 



Pulsations 



min. 



sec. 



per minute. 



Normal 





200 





10 



185 





20 



195 





40 



195 



1 



00 



190 



3 



00 



160 



13 



00 



195 



15 



00 



200 



Pneumogastric nerves and cord cut. Injected intravenously 

 the peptone from 0.015 gram dried venom of the Crotalus 

 adamanteus. 



