1226 



Number I Tempe- 

 of the ex- 

 periment rature 



49 



50 



51 



52 



53 



54 



12° 



16° 



13= 



13<: 



Exposure to 

 CO. 







10' 

 20' 











10' 

 20' 

 30' 

 30' 

 40' 

 50' 

 60' 











5' 



25' 



35' 



50' 





 15' 



25' 



35' 





 30' 



45' 

 45' 

 45' 







20' 



Stimulation- I Contraction- 

 ! height after one 

 interval stimulation 



Degree of 

 summation 



0.003" 



0.0022" 



0.0018" 

 0.0054" 



0.002" 



0.0063" 



M 



0.0063" 

 0.0084" 

 0.0157" 



0.0048" 



0.04 

 0.04 

 0.025 



0.08 



0.08 



0.05 



0.038 



0.075 



0.027 



0.027 



0.03 



0.03 







0.035 



0.01 



0.01 



0.022 







0.033 

 0.05 

 0.12 

 0.13 



0.15 



0.103 







0.02 



0.054 



0.074 

 0.117 



