On the different Forms of .Breathing. 



103 



from one air holder to another by means of stopcocks ; thus forced 

 air expired in three successive periods of three minutes each was 

 collected without undergoing the slightest loss. If the excess of 

 CO 2 expired in forced breathing is really taken from that stored up 

 in the blood, then it will be obvious that the second quantity of 

 forced air expired will contain less C0 2 than the first, and the third 

 quantity less than the second ; moreover, the difference will be less 

 and less as the experiment progresses, resulting in a curve of a 

 parabolic form.* The experiment fully proved the correctness of 

 the theory, three experiments for the author giving the following- 



curves : 



| 3 - T 



2 N - 



3"-" 



* As the volumes of CO 3 expired from the blood-store depended on the volumes 

 of air inspired (or expired), the CO 2 expired was calculated for the mean volumes 

 of air expired in the three different bell-jars; by this means the volumes of CO 

 obtained in those different bell-jars could be correctly compared with each other. 



VOL. LV1I. 



