1911.] Ventilation of the Lung during Chloroform Narcosis. 361 



Fig. 8. 



Depth of respiration, 1 division = 21'28 c.c. ; time intervals, 30 sees. ; |, 3*2 per cent, 

 chloroform on. 



1st chloroforming. 



2nd chloroforming. 



Fre- Ampli- Ventilation, 

 queney. tude. 



CHC1 3 on 

 3 per cent. 



77 -46 

 37 -24 



1 2017 

 1-1164 



; fl7 



CHCI3 off. A few gasps asphyxial. 



32 -56 

 29 -15 

 24 -54 



CHCI3 off. 



1 1523 

 1 1445 



Intervals of time. 



Anaesthetic. 



3rd chloroforming. 



Frequency. 



Amplitude. 



Ventilation. 



1 min. before CHC1 3 





46 



41 -92 



1928 



"5 min. 



CHCI3 on 



25 



38 -3 



958] 





3 - 2 per cent. 







V2182 



5 „ 





42 



29-15 



1224 J 



0-5 „ 





92 



32 -77 



3015 



0-5 „ 











3rd „ 





106 



28 -73 



3045 



4th „ 





125 



21 -57 



2699 



5th „ 





150 



7-45 



1117 



6th „ 





139 



7-66 



1065 



The complete course of the third chloroforming, which was continued until 

 death in 31 minutes, is shown in Curve V. 



No doubt the early cessation of respiration in the first chloroforming 

 was largely due, as we have pointed out, to the excessive lung ventilation 

 prior to the ansesthetic, combined with the high percentage of chloroform ; 



