120 



THE VENOMS OF CERTAIN THANATOPHIDE^E. 



Experiment No. 2. 



Length of 



Normal 



Time: 



Respirations 



/ curve 



lin. sec. 



per 



minute. 



m.m. 







42 



6 



10 





43 



10 



40 





? 





1 00 





84 



12 



2 10 





30 



25 



3 40 





9 



23 



5 00 





10 



14 



5 10 









Experiment No. 3. 



Normal 







Length of 



Time: 



Respirations 



curve 



min. sec. 



per minute. 



m.m. 





84 



1 



20 



158 



3 



40 



120 



1 



1 00 



96 



11 



1 30 



90 



10 



2 00 



96 



12 



2 30 



102 



10 



3 00 



120 



T 



3 30 



35 



5 



4 30 



60 



6 



5 30 



35 



10 



6 30 



10 



7 



7 30 



4 



4 



Experiment No. 4. 



Normal 



REMARKS. 



Injected intravenously 0.004 gram dried venom of the 

 Crolalus adamanteus 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 

 Grotalus adamanteus dissolved in 3 minims distilled 

 water. 









Length 



Time: 



Respirations 



curve 



lin. sec. 



per 



minute. 



m. m. 







66 



6 



15 









30 





36 



16 



1 00 





12 



16 



1 50 





18 



6 



2 20 

 2 25 



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. 



Injected intravenously 0.015 gram dried venom of the 

 Crotalus adamanteus 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. 



