1891.] 



Phenomena of Human Respiration. 



107 



at the other with a U' saa P e( ^ pip e > opening under the bell-jar in the 

 ordinary way. The bell-jar holding 35 litres of air is perfectly counter- 

 poised, so that the operator moves it up and down unconsciously in 

 the act of respiration, while the oil-gauge on the bell-jar registers 



VOL, XLIX. I 



