366 Messrs. G. A. Buckmaster and J. A. Gardner. [Aug. 19, 



ventilation of the lung depended on the rate and depth of the respiration 

 before the administration of the anaesthetic. The general effect of ether is 

 to reduce the respiration to a lower level. This reduction is at first rapid, 

 and then, after the first few minutes, proceeds slowly. This is illustrated by 

 the two following examples : — 



Example V. — The cat, weight 3 - 2 kgrm., was anaesthetised with nitrous 

 oxide, the necessary operations performed, placed in the plethysmograph, 

 and allowed to recover. Ether 6 - 4 per cent, was administered. The data of 

 the first 10 minutes of this experiment are given in Table XII. 



Curve VI. 



