f9(J ^'^ RESPIRATION. 



th« apparatus from the water gasometer, and rej^istering it in the mercu- 

 per ect. rial ones, we were satisfied that the apparatus was quite 



perfect. It is, however, to be considered, that the respira- 

 tion in this case was not natural, and that some small degree 

 of force was required when the inspirations and the expira- 

 tions were made in the mercurial sjasometers, which renders 

 this experiment rather different from those wliich had pre- 

 ceded it: and it appears to us probable, that a portion of 

 air was forced into the extremities of the broochiie, which 

 could not be suddenly expelled by the strongest attempts at 

 expiration. Hence also, perhaps, the constant ihough smaller 

 deficiency, even when the air was only once passed through 

 the lungs ; but when the process is continued for a much 

 lo'jger time, it is probable that the vessels recover their 

 tone, and are able neariy to expel the whole of the volume 

 admitted. 

 / The air expired in the present instance , being examined 



in the mat-ner described in our last paper, we found that 

 100 parts, from each of the gasometers contained the fol- 

 lowing proportions : 



No. 4, 



State of the air No 

 after respir- 

 ation. 



Ko. 2. 



10 carbonic acid 

 21 azote 

 69 ozigen 



100 



10 carbonic acid 

 1 I azote 

 79 oxigen 



100 



No. 3. 10 carbonic acid 

 8*5 azote 

 81 '5 oxigeo 



100 



10 carbonic acid 



7'75 azote 

 82-25 oxigen 



No. 5. 



100 



10 carbonic acid 

 7 azote 

 83 oxigen 



100 



5*5 azote 

 84 oxigen 



100 



We shall first calculate the total quantity of azote exist- 

 ing in the gas before the experiment, and afterwards esti- 

 mate what was produced in the different periods during 

 the first half of the experiment, 



Calcu' 



