1911.] Ventilation of the Lung during Chloroform Narcosis. 365 



Table X. 



Intervals of time. 



Frequency. 



Amplitude. 



Ventilation. 



1 niin. before CHC1 3 

 - 5 min., 2 per cent. CHC1 3 on 

 0-5 „ 

 0-5 „ 

 0-5 „ 

 1 



55 

 24 

 19 



33 

 64 



48 -28 

 26 -86 

 29-14 

 30 -71 

 29 -00 

 26-14 



2656 

 1699 



The animal was allowed to recover for six minutes ; when the reflexes had 

 reappeared, T5 per cent, chloroform was given for 10 minutes, after which it 

 was increased to 2 - 5, and finally to 3 per cent. The increasing percentage of 

 chloroform produced an increase in rate and considerable decrease in the 

 average depth, but had a comparatively slight effect on the total ventilation 

 of the lung, as may be seen from the data given in Table XI. 



Table XL 



Intervals of time. 



Anaesthetic. 



Frequency. 



Amplitude. 



Ventilation. 



-5 min. before CHC1, 

 0-5 „ 



0-5 „ 



1 ». 

 1 



1 -5 per cent. CHC1 3 on 



30 

 27 

 24 

 49 

 57 



34 29 

 25 -71 

 22 -14 

 21-44 

 22 -14 



1028 



694\ 100 . 



531 } 1220 

 1050 

 1129 



g " J" coun ' e< i 











6 





65 



27 -71 



1194 



7 » 1 



8 „ y Not counted 



9 „ J 











10th „ 

 11th „ 



12th „ Not counted 

 13th „ 

 14th „ 

 15th „ 

 16th „ 



0-5 „ 



0-5 „ 



2 -5 per cent. CHC1 3 on 

 3 per cent. CHC1 3 on 



56 

 59 



56 

 66 

 60 

 64 

 30 



Ceased to 

 breathe 



18 -43 

 16-66 



12 -57 

 11 -57 

 11 -19 

 10 -14 

 6-97 



1032 

 983 



830 

 764 

 738 

 648 

 209 



Ventilation of the Lung during Narcosis with Ether. 

 Adopting the same methods of experiment as with chloroform, a number 

 of plethysmographic records were taken of cats anaesthetised with ether, the 

 percentage of which varied between 6'4 and 14 per cent. These values were 

 controlled by Waller's balance. It was found, on comparing the various 

 tracings, that, as in the case of chloroform, the effect of the drug on the 



2 E 2 



