1874-.] Poison of Indian Venomous Snakes. 127 



Experiment LXXIV. 



A cannula was placed in the carotid of a dog and connected with a 

 kymographion. 



Mean blood-pressure. Pulse 

 Time. millims. per minute. 



1.36 150 144 Injected some cobra-poison dis- 



solved in water into the sciatic 

 vein. The pressure rose to 165, 

 165 and then sank in 7 seconds to 



135 135. 



1.45 50 



1.48 57 .. Faeces passed. A clot formed in the 



cannula and had to be removed. 



1.55 70 



About 1.58 80 . . Injected some more poison. 



1.58=| 20 



1.59 55 



1.59 70 . . Clot again formed. 



2.2 75 



2.7 85 



2.10 85 



2.16 80 . . Legs loosened ; but the animal did 



not move. Convulsive move- 

 ments occurred almost imme- 

 diately afterwards. 



2.17-J- . . . . Cornea still sensible. 



2.18 85 . . Convulsive movements. 



2.19| 90 . . Convulsions. 



2.20i 80 80 No movement. 



2.20J 90 64 The pulse here suddenly changed 



from 80 to 64 ; and at the end of 

 every third beat the pressure 

 sank 25 millims., while at each of 

 the others it only sank 5 millims. 



2.21 ^ 98 . . Height of each single pulse-wave is 



now 10 millims. instead of 5, and 

 every now and then it sinks 30; 

 but the number of beats after 

 which it sinks is not now so re- 

 gular. 



2.21| 100 64 Convulsions. 



2.22J 105 . . There were now 8 pulsations, and 



then an interval of 6 seconds, 

 during which the pressure went 

 down to 43 millims. Five beats 



