120 



THE VENOMS OF CERTAIN THAN ATOPHIDE JE. 



Experiment No. 2. 



Normal 



of 



Experiment No. 3. 



Normal 



Experiment No. 4. 



REMARKS. 



Injected intravenously 0.004 gram dried venom of the 

 Crolalus adamanleus dissolved in 1 c. c. distilled 

 water. 



Struggles, which prevent a count. 



Convulsive movements. 

 Conjunctival reflexes gone. 



Respiration ceased. Heart still beating. The respira- 

 tory muscles respond to stimulus. The spinal cord 

 was exposed, and the motor columns were found to 

 respond to electrical stimulus. The motor nerves 

 responded after the motor columns of the cord had 

 lost their irritability. 



REMARKS. 



Injected intravenously 0.006 gram dried venom of the 

 Crotalus adamanleus dissolved in 3 minims distilled 

 water. 



Time : Respirations 



min. sec. per minute. 



Normal ... 66 



15 



30 

 00 

 50 



36 

 12 

 18 



2 20 

 2 25 



Length 

 curve 

 m. ra. 

 6 



16 



16 



6 



5 



Struggles. 



Conjunctival reflexes gone. 



Respiration ceased. Respiratory muscles irritable. 

 The spinal cord was quickly exposed ; the sensory 

 columns give no response, the motor columns are 

 active. The motor columns of the cord fail before 

 the motor nerves. 



of 



REMARKS. 



Injected intravenously 0.015 gram dried venom of the 

 Crotalus adamanleus dissolved in 1 c. c. distilled 

 water. 



Arrest of respiration attended with a tetanic condition. 



Respiration ceased. Spinal cord rapidly exposed and 

 tested by electrical currents; sensory columns fail 

 first, then the motor columns, then motor nerves. 



